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We are now in position to again invite orders for high-class instruments made by the British firm of Adam Hilger, Ltd.,-including Spectroscopes, Spectrographs, Spectrometers, Spectrophotometers, Interferometers, Polarimeters, Refractometers, etc.

This will be welcome news to those Scientists who are in need of such equipment, and are familiar with "Hilger quality."

Orders should be placed now, for apparatus that is to be used next autumn.

JAMES G. BIDDLE

1211 Arch St., Philadelphia

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According to Theodore Kuttner, M.D., New York
Adopted as standard by leading laboratories and Medical
Departments of the U. S. Government

This instrument in case offers a little laboratory in itself
This colorimeter represents an apparatus indispensable for clinical diag-
nostic work.
The following tests can be completed: Hemoglobin, Sugar in Blood, Phe-
nolsulphonephthalein, Uric acid in urine and stone, Uric acid in blood,
Creatine in urine, Creatinine in urine, Creatinine in blood.

Summary of Points of Merits

1. The capability to use less reagents for the test.

2. The saving of time and labor.

8. The probability of more often obtaining such material.

4.

Test can be completed in 5 to 10 minutes, or even less in some instances. 5. Without expensive reagents.

6. Without extraordinary implements or other than those provided with the apparatus.

7.

Special laboratory training is not essential.

8.

10

Standard test solutions used are stable inasmuch as a solution of inorganic salts is employed.

ELEITZ NY
B

9 10 11

30 East

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SARGENT'S

ELECTRIC DRYING OVEN

With Automatic Temperature Control

(Patented Jan. 6, 1914)

This is the pioneer of moderate-priced ovens in this class, and the hundreds now in satisfactory operation prove its success. This end has been achieved by ruggedness of construction, elegance of design and due observance of the scientific principles which are demanded in drying ovens.

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Its extreme simplicity precludes the imitation of its patented features and enables it to maintain its position as the best and cheapest apparatus on the market for its purpose.

Extended Descriptive Circular on Application

Price complete, with six foot cord, plug for connection to lamp socket
and thermometer $27.50 net.

E. H. SARGENT & CO.

Importers, Makers and Dealers in Chemicals and

Chemical Apparatus of High Grade only

125-127 W. Lake St.

Chicago, Ill.

ABBE REFRACTOMETER

MADE BY ADAM HILGER, LTD., LONDON

IN STOCK FOR IMMEDIATE SHIPMENT

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45761. Refractometer, Abbe, Hilger, new 1918 model, with water jacketed prisms, for the measurement of the refractive index of liquids or solids to an accuracy of from one to two units in the fourth decimal place in the interval 1.3000 to 1.7000 and of the dispersion, i. e. the difference of refractive index for the C and F lines of the hydrogen spectrum, or liquids and solids to the same accuracy, the latter by means of dispersion tables supplied with each instrument. With thermometer, test plate, oz. Monobromnaphthalene, and booklet "Instructions for Use," in case with lock and key. Duty Free.... ....253.80 Stock.....

.347.80

45825. Refractometer, Abbe, same as above, but with addition of a scale reading directly in percentage of dry substance in sugar juices, thus avoiding the use of conversion tables when refractometer is used in sugar analysis; adjusted for a temperature of 20° C. Duty Free. ..272.05

Stock....

..372.80

45826. Refractometer, Abbe, same as above, but with scale adjusted for a temperature of 28° C. for use

in the tropics.

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We have a stock of the following instruments ordered from ADAM HILGER, Ltd., London, on which we are promised delivery from earliest possible production:

PULFRICH REFRACTOMETERS (Now in Stock)
DIPPING REFRACTOMETERS

RAYLEIGH INTERFERENCE REFRACTOMETERS

SACCHARIMETERS

POLARIMETERS

WAVELENGTH SPECTROMETERS Constant De

viation Type, with Nutting Photometer

Orders accepted for Waiting List at definite prices but with only approximate dates for delivery when instruments are not actually in our stock

ARTHUR H. THOMAS COMPANY

IMPORTERS-DEALERS-EXPORTERS

LABORATORY APPARATUS AND REAGENTS

WEST WASHINGTON SQUARE

PHILADELPHIA, U. S. A.

SCIENCE

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METHODS OF SECURING BETTER COOPERATION BETWEEN GOVERNMENT AND LABORATORY ZOOLOGISTS IN THE SOLUTION OF PROBLEMS OF GENERAL OR

NATIONAL IMPORTANCE1

LET us admit at once that government bureaus have great difficulty in getting men trained for their work. Let us go further, and admit that government bureaus have practically, except for certain fundamentals, to train their own men. Let us acknowledge also that the men in charge of the biological laboratories of the universities of the country are ready and anxious to train their men to be of the greatest possible service to the country, and that this readiness and this anxiety have been intensified by the great crisis through which we have been and are still passing.

How is this to be brought about? Plainly by a very perfect understanding and sympathy between the men in charge of the government bureaus and the men in charge of the university laboratories.

Although this suggestion has been made a number of times (I made it myself twenty years ago in an address before the American

1 A symposium before the American Society of Zoologists, held at Baltimore on December 26, 1918, Professor C. E. McClung presiding, included papers and discussions as follows: Representing the Bureau of Entomology, Dr. L. O. Howard. Discussion by J. G. Needham, representing the Bureau of Fisheries, Dr. Hugh M. Smith. Discussion of Dr. H. B. Ward. Representing the Bureau of Animal Industry, Dr. B. H. Ransom. Discussion by Dr. Herbert Osborn. Representing the Bureau of Biological Survey, Dr. E. W. Nelson. Discussion by Dr. R. K. Nabours. Relation of the Council of National Defense and the National Research Council to the Advancement of Research, Dr. John C. Merriam.

Society of Naturalists at Baltimore), this present discussion is, I hope, an emphatic and practical beginning of a definite movement which will bring results. It is primarily, perhaps, for the government men to point out the needs. They are now assured of the warm desire to cooperate on the part of the university men, and it is only by the closest cooperation that the best results can be secured. This involves more than mere suggestions from the government to the universities. It should mean a thorough knowledge on the part of the heads of the university laboratories of the intimate nature of the problems being studied and of the methods which are being adopted to solve these problems. Such a knowledge as this can best be gained by personal contact with the workers, and such contact should be of such a nature as to bring about not only suggestions to the teachers as to the best methods of training their men for future government work but also suggestions from the trained minds of the teachers as to other directions or means of attacking the problems which the government is trying to solve.

It would be an ideal arrangement if every highly trained laboratory man in the principal universities could be made a collaborator of some government scientific bureau and could be permitted and encouraged at government expense to visit for a longer or shorter time the different field laboratories of the government working in lines in which he himself is working, and thus bring about the personal knowledge and personal contact necessary for both lines of suggestion. Such an arrangement in a large way is probably impractical at present, but it might be started in a small way and in individual cases and will probably become eventually a fixed and valuable policy.

And now as to teaching and the training of workers, I don't know whether as a rule teachers have kept positive and relative values clearly in their own minds and in the minds of their students. Do they point out plainly the practical utilizations of zoology? Do they show their students the whole of the field

that is open to the trained investigator, and do they make their teaching as broadly attractive as possible? Have they made enough use of the great out-of-doors? Are they utilizing to the full the educational help of the motion picture?

In general, a man coming from a university to that branch of the government service with which I am connected should be fundamentally sound in botany, chemistry and physiology, and he should have an acquaintance with the principal foreign languages in which the results of important work are published.

There is need, as my colleagues who are to speak for other government bureaus will readily admit, for several different types of men in the service-men who have been trained for different kinds of work-and this should be borne in mind in considering the following suggestions.

We need more training in taxonomy, that basic branch of zoology upon which all other work rests.

We need an infinite amount of investigation in the different tropisms, in behavior, in all ecological lines, and, considering relative values, forms should be chosen for such studies from among those species which have an important economic rank or from among very closely related forms. In many cases enormous time has been comparatively wasted from the want of recognition of the importance of this point.

There should be careful training in the planning of experiments, in the interpretation of results, in the collation of suggestive results, and in the preparation of reports. The average man coming from a university is wofully lacking in the latter training, and gains it with slow progress after entering the government service.

As to cooperative work between the uni versities and the government laboratories, in addition to the training of men by the former for service in the latter, there is much that can be done aside from this training and the possible official collaboration of certain teachers with traveling privileges hinted at in a former paragraph.

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