not be prepared. A large number of inquiries are received for chemicals which we could never hope to furnish; in some instances, the preparations could be undertaken, but it is questionable whether the time devoted to working out the method and preparing a stock might not be better applied to some problem for which there is greater urgency. Our desire is to serve the research chemists of the United States, but to do this to best advantage it is necessary to consider the interest of the greatest number. We acknowledge with gratitude the continued support of the chemical manufacturers, who have supplied us not only with their regular products, but often with those which are available in quantities too small to place on the open market. The amount of chemicals sold continues to increase slowly but steadily, and the department is now almost selfsupporting. It is at present being transferred to new laboratories especially designed and erected for the work, and it is expected that greater efficiency will be possible than in the improvised laboratory where the work was begun. The production of benzoic acid and benzophenone from benzene and phosgene: ROBERT E. WILSON and EVERETT W. FULLER. The nature of the reactions of anilines upon nitrosophenol: CARLETON E. CURRAN and C. E. BOORD. Experimental evidence shows that the first reaction product between aniline and nitrosophenol is quinone phenylhydrazone. Dilution or neutralization of the reaction mixture converts this substance into its tantomer phenyl-azophenol. Subsequent action of aniline upon the quinonephenylhydrazone converts it into mono-anilino quinonephenylhydrazone, dianilino quinone and azophenine, in turn. The theory is proposed that the formation of indamines by the action of anilines upon nitrosophenol is due to the semidine rearrangement of quinone-phenylhydrazones. Reduction of polynitrophenols by hydrogen sulphide in the presence of ammonia: L. CHAS. RAIFORD. In the preparation of starting material with which to test further the migration of acyl noted in a previous paper (Jour. Am. Chem. Soc., 41, 2068 (1919)), with a view to determining the effect of acid-forming substituents in the aminophenol 2, 4-dinitrophenol was reduced by hydrogen sulphide in the presence of ammonia in the usual way. Contrary to what has heretofore been reported, isomeric substances were obtained. Work is in progress to determine the effect of other substituents (compare Anschutz und Heusler, Ber., 19, 2161 (1886)). The action of ammonia and on allophanic ester: F. B. Da THEIM. Hydrazoisopropane: H. L. I BAILEY. A convenient method for bromohydrins: J. B. CONANT an Addition reactions involving ence of a single atom: J. B. Co New derivations of thymol an L. SHERK and EDWARD KREME drone hypothesis of plant pigme of the biochemistry of the Mona a revision of the underlying study has been continued, especia of intramolecular changes such selves in connection with the nitr the above mentioned phenols an rearrangement products. The action of amines upon thym A. WAKEMAN and HARLAN G. methylamidothymoquinone, prepa Zincke, yields a platinic chloride taining 41 per cent. of platinum, the union of one molecule of the acid platinic chloride. Thymoqui benzylamine, in alcoholic solu benzylaminothymoquinone, with s aminothymoquinone. Thymoquin also with p-toluidine, under the yields the di- derivative. No have been isolated here. Thymoqu idine, under the same condition purple crystalline derivative, the which has not yet been determine Organic mercury compounds of C. WHITMORE and E. B. MIDDLETO CHARLES CORNELL UNIVERSITY UNIVERSITY MEDICAL COLLEGE First Avenue and Twenty-eighth Street NEW YORK CITY For Information Address THE SECRETARY 477 FIRST AVENUE NEW YORK, N. Y. The Fourth Year Course Physics, Chemistry, Biology, and French er German. Six and seven years' combination courses are offered. are spent in mastering by laboratory methods the sciences fundamental to elinical medicine. is systematic and clinical and is devoted to the study of the natural history of disease, to diagnosis and to therapeutics. In this year the systematic courses in Medicine, Burgery and Obstetrics are completed. is clinical. Students spend the entire foreneon throughout the year as clinical clerks in hospitals under careful supervision. The elinical alerk takes the history, makes the physical examination and the laboratory examinations, arrives at a diagnosis which he must defend, outlines the treatment under his instructer and observes and records the result. In case of operation or of autopay he follows the specimen and identifies its pathological nature. Two general hospitals, one of which is owned and controlled by the University, one special hospital and the municipal hospitals and laboratories are open to our students. The afternoons are spent in the College Dispensary and in clinical work in medical and surgical specialties and in conferences. Johns Hopkins University Tulane University of Medical School The Medical School is an Integral Part of the University and is in close Affiliation with the Johns 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 physics and biology, together with evidence of a reading knowledge of French and German. Each class is limited to 90 students, men and women being admitted on the same terms. Except in unusual circumstances, applications for admission will not be considered after July 1st. If vacancies occur, students from other institutions desiring advanced standing may be admitted to the second or third year provided they fulfill all of our requirements and present exceptional qualifications. 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. The annual announcement and application blanks may be obtained by addressing the Dean of the Johns Hopkins Medica School Washington and Monument Sts. BALTIMORE, M.D SUMMER WORK FOR GRADUATES Beginning Tuesday, June 6th, and ending Thursday, July 16th, a course in medical diagnosis, including laboratory exercises in clinical pathology and demonstrations in pathological anatomy, will be offered. The course will be limited to twenty students, fee $100. Applications should be made to the Dean's Office. Louisiana SCHOOL OF MEDICINE (Established in 1834) ADMISSION: All students entering the Freshman Class will be required to present credits for two years of college work, which must include Chemistry (General and Organic), Physics and Biology, with their laboratories, and at least one year in English and one year in a modern foreign language. COMBINED COURSES: Premedical course of two years is offered in the College of Arts and Sciences, which provides for systematic work leading to the B.S. degree at the end of the second year in the medical course. School of Pharmacy, School of Dentistry and Graduate School of Medicine also. Women admitted to all Schools of the College of Medicine For bulletins and all other information, address Tulane College of Medicine P. O. Box 770 New Orleans, La. X SUPPLY DEPARTMENT Open the Entire Year Courses of laboratory instruction Liv Animals and plants, preserved, liv- GEO. M. GRAY, Curator, Woods Hole, Mass. Yale Univ SCHOOL OF M Affiliated with the New H and New Haven Dia 109th Sessi Reorganized on a fullEntrance Requirement of two years (or its equiva including general biology, and organic chemistry, ph or laboratory physics, and or German. ALL OF THE GENERAL As the number admitted Dean, Yale Univer of Medicin NEW HAVEN, C The Silverman Illuminator "A New Eye for the Microscope" a-Shows more detail. b-Presents a clearer and better defined picture camera. c-Produces several novel d-Save very much valu- e-Prevents eye strain, eye g-Gives excellent results for very low power h-Can be used with any A small circular tube lamp surrounds the objective and For sale by all the better dealers Write for Bulletin 45-B AGATE MORTARS Of excellent quality and workmanship La Motte Indicator Field Set for Determining Acidity and As used in studies described by E. T. Wherry, Jour., Wash. In Stock for Immediate Delivery Acad. Sci., April, 1930, and Rhodora 23-1920. |