Lapas attēli
PDF
ePub

ascidians, but the presence of vanadium in practically equal, in nutritive properties, to association with the proteid escaped Griffith's the unheated raw milk. The pasteurized observation. Whether non-metallic respiratory milk, heated at 145° F. for 30 minutes, propigments represent degeneration, or whether duced scurvy very quickly and all of the they are phylogenetic predecessors of metal- animals died in a very short time. Examinalic pigments, is difficult to decide; but their tion revealed the fact that the pasteurized presence in the animal kingdom shows that milks had been stirred rather violentiy with the function of oxygenation is not dependent motor-driven propellors, while the boiled milk upon the presence of a metal in the pigment had not been stirred mechanically. This led molecule-a fact which gives strong indica- us to believe that oxidation had occurred in tion that the association with metals was the pasteurized milks due to the intimate conoccasioned by the need of a greater capacity tact of air with the milk particles. Consefor ready oxidation and reduction, the need, quently, many new animals have been added that is, of a catalyst.

with the result that we have been able to show JOHN F. FULTON, JR. that the nutritive and antiscorbutic properHARVARD UNIVERSITY

ties of cow's milk are destroyed by oxidation.

Some destruction occurs when air is bubbled THE INFLUENCE OF HEAT AND OXIDATION through milk at 145° F. for 30 minutes, but UPON THE NUTRITIVE AND ANTISCOR

the destruction is much more marked when BUTIC PROPERTIES OF COW'S MILK

oxygen or hydrogen peroxide is used. OxyIn a recent paperfrom the Minnesota Ex- gen and hydrogen peroxide will destroy the periment Station we submitted data which antiscorbutic accessory at room temperature indicated that the nutritive and antiscorbutic although the destructive action is hastened properties of cow's milk are dependent upon as the temperature increases. Milk may be the nature of the feeding materials which pasteurized in closed vessels or boiled in the constitute the dairy ration.

open air without appearing to lose its nutriIn April, 1920, a series of studies was tive and antiscorbutic properties when fed to initiated with the view of ascertaining the in- guinea pigs. When carbon dioxide is bubfluence of heat upon the nutritive properties bled through the milk, it compares very favorand the antiscorbutic potency of milk. The ably in nutritive properties with the raw milk. experimental milk used in these studies was Our work, now in progress, on orange juice obtained from an Ayershire cow fed upon a shows that the antiscorbutic properties are ration composed of the same types of feeding not destroyed by boiling for 30 minutes. At materials throughout the experimental period. least, if destruction occurs it is not discernBy this method it was hoped that we might

ible with the methods employed. Hydrogen eliminate fluctuations in the vitamine content

peroxide destroys the antiscorbutic factor in of the dairy ration and thereby reduce to a

orange juice at room temperature, and the minimum any variations in the nutritive

speed of the oxidation is hastened as the properties of the milk.

temperature increases. Oxidation would apIn these studies we have used a total of 163

pear to be a more important factor than heatguinea pigs, and control groups were included in each series. In the first series of experi- ing as far as the nutritive and antiscorbutic

properties of milk are concerned. ments it was found that boiled milk was

EDLA V. ANDERSON, 1 Published with the approval of the director as

R. Adams DUTCHER, Paper No. 247, of the Journal Series of the Min

C. H. ECKLES,
nesota Agricultural Experiment Station.
2 Dutcher, R. A., Eckles, C. H., Dahle, C. D.,

J. W. WILBUR
Mead, S. W., and Schaefer, O. G., J. Biol. Chem., MINNESOTA EXPERIMENT STATION,
XLV., 119-132, December, 1920.

UNIVERSITY FARM, ST. PAUL

[blocks in formation]

Johns Hopkins University Tulane University of

Louisiana SCHOOL OF MEDICINE

Medical School The Medical School is an Integral part of the University and is in closo Affiliation with the Jobos Hopkins Hospital

ADMISSION Candidates for admission must be graduates of approved colleges or scientific schools with at least two year's instruction, including laboratory work, in Chemistry, and one year each in

(Establishod in 1834) physics and biology, together with evidence of a reading knowl | ADMISSION: All students entering the Freshman edge of French and German.

Each class is limited to 90 students, men and women being Class will be required to present credits for two admitted on the same terms. Except in unusual circumstances,

years of college work, which must include applications for admission will not be considered after July 1th Ir vacancies occur, students from other institutions desiring

Chemistry (General and Organic), Physics and advanced standing may be admitted to the second or third year Biology, with their laboratories, and at least provided they fulfill all of our requirements and present ex. one year in English and one year in a modern ooptional qualifications.

foreign language. INSTRUCTION

COMBINED COURSES: Premedical course of two The academic year begins the Tuesday nearest October 1 and closes the third Tuesday in June. The course of instructon,

years is offered in the College of Arts and occupies four years and especial emphasis is laid upon prao

Sciences, which provides for systematic work Mcal work in the laboratories, in the wards of the Hospital and in the Dispensary.

leading to the B.S. degree at the end of the TUITION

second year in the medical course. The charge for tuition is $250 per annum, payable in three Instalments. There are no extra fees except for rental of microscope, certain expensive supplies, and laboratory breakage.

School of Pharmacy, School of Dentistry and The annual announcement and application blanks may bo Graduate School of Medicine also. obtained by addressing the Dean of the Johns Hopkins Medica School

Women admitted to all Schools of tho Washington and Monument Sts. BALTIMORE, M.D

College of Medicine
SUMMER WORK FOR GRADUATES
IN MEDICINE

For bulletins and all other information, address Beginning Tuesday, June 6th, and ending Thursday, July 16th, a course in medical diagnosis, including laboratory exer

Tulane College of Medicine cises in clinical pathology and demonstrations in pathological

P. O. Box 770 anatomy, will be offered. The course will be limited to twenty students, fee $100. Applications should be made to the Dean's

New Orleans, La, Office.

Northwestern University
Medical School

Yale University

SCHOOL OF MEDICINE Situated in Chicago in close proximity to important | Hospitals with an abundance of clinical material.

Affiliated with the New Haven Hospital Admission Requirements—Two years of College credit

and New Haven Dispensary including sa satisfactory course in Physics, Chemistry,

109th Session Biology or Zoology, and French or German.

Reorganized on a full-time basis
Course of Study-leading to the degree of Doctor of
Medicine Four years in the Medical School and a

Entrance Requirements : A minimum fifth year either as Interne in an approved hospital or devoted to research in some branch of Medical of two years (or its equivalent) of college Science.

including general biology, physics, general Graduate Instruction in courses leading to the degree and organic chemistry, physical chemistry of Master of Arts or Doctor of Philosophy.

or laboratory physics, and either French Research Foundation, The James A. Patten Endow or German. ment for Research affords unusual opportunities for

ALL OF THE GENERAL FACILITIES advanced students of Medical Science to pursue

OF THE UNIVERSITY ARE AVAIL. special investigations.

ABLE TO MEDICAL STUDENTS Research Fellowships-Four fellowships of the value

of $500 each are awarded annually to promote As the number admitted to each class is scholarly research.

limited, applications must be made before Tuition Fees—The tuition fee for undergraduate stu.

June 15. dents is $180.00 a year.

Dean, Yale University School For information address

of Medicine C. W. PATTERSON, Registrar

NEW HAVEN, CONN. 1421 South Dearborn Street Chicago, Illinois

Marine Biological Laboratory

Woods Hole, Mass. INVESTIGATION Facilities for research in Zoology,

Embryology, Physiology, and Boto
Entire Year any. Eighty-four private labora-

tories, $100 each for pot over three
months. Thirty tables are avail-
able for beginners in research who
desire to work under the direction
of members of the statt. The fee
for such a table is $50.00.

[graphic]
[blocks in formation]

SUPPLY Animals and plants, preserved, liv

ing, and in embryonic stages. 'PreDEPARTMENT served material' of all types of

animals and of Algae, Fungi, LiverOpen the Entire Year worts and Mosses furnished for

classwork, or for the museum. Liy-
ing material furnished in season as
ordered. Microscopic slides in
Zoology, Botany, Histology, Bac-
teriology. Price lists of Zoological
and Botanical material and Micro-
scopic Slides sent on application,
State which is desired. For price
lists and all information regarding

material, address
GEO. M. GRAY, Curator, Woods Hole, Mass,
The annual announcement will be sent on application to The
Director, Marine Biological Laboratory, Woods Hole, Mass.

New type double walled Thelco Oven

Automatically controlled.
Moderately priced so that no Laboratory
need be without one.
Write for Descriptive Literature

Manufactured by
The Thermo Electric Instrument Co.
8 Johnson Street NEWARK, N. J.

New Books

That Have

a Message For You

Hygiene

Blood and Urine Chemistry By Clalr E. Turner, Asst. Prof. of Biology and

By R. B. H. Gradwohl, M.D., Director of tho Public Health, Mass. Institute of Technology;

Gradwohl Laboratories, Chicago and St. Louis; Chapters by Dean Rice, Tufts Dental College;

Director of the Pasteur Institute of St. Louis; Introduction by Wm. T. Sedgwick, Sc.D., Prof.

and A. J. Blalvas, formerly Assistant in Chemia of Biology and Public Health, Mass. Institute of

cal Laboratory, St. Luke's Hospital, New York.

418 pages, 6 x 9, 75 text illustrations and four Technology. 400 pages, 52 illustrations. Price, cloth

color plates . $4.00

Second edition, revised and en

larged. Price, cloth.... Turner has written a book on hygiene along

..$5.00

This second edition represents the accumulated entirely new lines and it is different from any

literature of the past three years on blood and thing heretofore published. A valuable book

urine chemistry both as regards technic and for dentists, physicians, public health workers,

interpretations. and teachers in colleges.

Physiological Chemistry Practical Chemical Analysis Brasidney, winCole, MA, Trinity College, Camof Blood

Hopkins, M.B., D.Sc., F.R.C.P., Professor of Bio

chemistry, Trinity College, Cambridge. 350 By Victor C. Myers, M.A., Ph.D., Prof. of Patho- pages, 512 x 812, illustrated. 5th edition, enlogical Chemistry, N. Y. Post-Graduate Medical

larged. Price, cloth...,

$4.50 School and Hospital. 125 pages, 7 x 10, with 13 New ifth edition, completely revised. The Illustrations. Price, cloth.

..$3.00

book is practical—the text was worked out Myers presents a discussion of the chemical

step by step at the laboratory bench at Camblood determinations which have been found of

bridge University, England. Modern methods definite value in the treatment and diagnosis of biochemistry are given. of disease. Complete literature references,

, standard solutions and reagents are given.

By C. J. V. Pettibone, Ph.D., Assistant Professor of Physiological Chemistry in the Medical School

of the University of Minnesota. 328 pages, 6 x 9, Epidemic Respiratory

with illustrations. Silk cloth binding. Price

.$2.76 Disease

Covers the general field of physiological chemBy E. L. Ople, M.D., Washington University Med.

istry. Gives a clear idea of the properties of School; James C. Small, M.D., Francis G. Blake, the compounds that are physiologically imM.D., Thomas M. Rivers, M.D. 402 pages, 6 x 9, portant, the action of the enzymes, composition 33 illustrations. Price, cloth...

..$6.50

of some common foods and important tissues, A complete discussion of pneumonias and

composition and analysis of urine, and review other infections of the respiratory tract accom

of present status of metabolism. Including panying influenza and measles, prepared under laboratory work with experiments. Surgeon-General's direction in leading army camps.

Selected Lectures and Essays
Including Ligaments—Their Nature and Mor-

phology, By Sir John Bland-Sutton, F.R.C.S., Wassermann Test

LL.D., London. Fourth revised edition. 320

pages, with 111 beautiful and original illustraBy Charles F. Craig, M.D., M.A., F.A.C.S., Lieut- tions. Price, cloth....

... $4.50 Col., U. S. A.; Prof. of Bact., Paras., and Prev. Med. Army Medical School, etc. 2nd revised en

The classic lectures and essays of the famous larged edition. 279 pages, illustrated with color surgeon, Bland-Sutton, covering such subjects plates. Price, cloth, 6 x 9..

... $4.25

as gizzards, ulcers, injuries to the heart, hernia Includes the modification of the complement- of uterus in men and women, tubal pregnancy, fixation test for syphilis adopted by U. 8. Public mastoid teeth, circumcision, atrocities of war, Health Service Laboratory. Used by the Sur- science of bull-ring, pulpue, medicine and the geon-General in the hospitals of the U. S. P. H. Bible, ligaments, slings, pulleys, legs, wings, Service. Entirely rewritten and revised.

flippers, muscles of the orbit, etc.

D You should order copies of these important book, today through your bookseller or direct from the pablishers. Also request a copy of our complete catalogue of medical, dental, scientisc, pharmaceutical, and nursing pablications. Mention “ Science” when writing or ordering.

THE C. V. MOSBY COMPANY 801-809 Metropolitan Building

Publishers ST. LOUIS, MO.

[graphic][subsumed]

The Silverman Illuminator

"A New Eye for the Microscope" 8-Shows more detail.

Presents a clearer and
better defined picture
to the eye and the

camera.
6-Produces several novel

methods of illumina

tion.
d-Save very much valu-

able time.
Prevents eye strain, eye

fatigue and brain fag. f-Can be lowered into deep,

hollow objects
g--Gives excellent results

for very low power
work, also higher mag-
nifications, and in oil

immersion work,
h-Can be used with any

microscope, ordinary or
binocular.

[graphic]

A small circular tube lamp surrounds the objective and furnishes diffused and uniform illumination directly where it is needed. For sale by all the better dealers

Write for Bulletin 45.B LUDWIG HOMMEL & CO. 530-534 Fernando St. Pittsburgh, Pa.

Natural History Material ZOOLOGY MINERALOGY

Naturalists' Supplies

We have been handling Natural History Material of all kinds for the past fifty years, and so have accumulated a very complete stock. Our prices are as low as the quality of the specimens will permit. We are constantly preparing circulars and price lists covering our material in the different branches, which we will be pleased to send free of charge to the readers of Science. Some of our recent circulars :

S-121 Rare Bird Skins
S-122 Mounted Bird Skins
S-98 Material for Dissection
S-123 Philippine Land Shells
S-120 Special Minerals
S-110 Complete Trilobites
S-111 Jurassic Fossils

S-119 Cretaceous Fossils CONCHOLOGY GEOLOGY

We carry a stock for prompt delivery

I. Collecting Utensile.
II. Breeding Apparatus and Cages for Living

Animals.
III. Preparing and Preserving Utensils.
IV. Cabinets and Insect Cases.

V. Magnifiers, Microscopes and Accessories.
VI. Botanists' Supplies.
VII. Explorers' and Collectors' Camp Outfits.
VIII. Miscellaneous Naturalists' Supplies.
IX. Oologists' Supplies.

X. Aquaria.
XI. Books and Publications.
XII. Chemicals

K-S Museum Cabinets of Glass and Metal
Now Illustrated Biological Catalogue will be sent tree

of charge upon application

Ward's Natural Science

Establishment College Ave. Rochester, N. Y.

THE KNY-SCHEERER CORPORATION Dept. of Natural Science 404-410 W. 27th St G. Lagai, Ph.D.

Now York City

« iepriekšējāTurpināt »