SCIENCE— ADVERTISEMENTS 



School of Hygiene and 

 Public Health 



OF 



The Johns Hopkins Unirersity 



The third session opens September 28, 1920. Opportunities 

 for instruction and investigation will be offered in Public 

 Health Administration, Epidemiology, Bacteriology, Immun- 

 ology and Serology, Medical Zoology, Biometry and vital Sta- 

 tistics, Sanitary Engineering, Physiology as applied to hygiene, 

 including the principles of industrial andeducationalhygiene. 

 Chemistry as applied to hygiene, including the analysis of 

 foods and ttie principles of nutrition. Social and Mental Hy- 

 giene, etc. The courses in these subjects are organized upon a 

 trimestral basis, and students may enter the School as candi- 

 dates for a degree, or as special students, at the beginning of 

 any trimester. Men and ■women students are admitted on the 

 same terms. 



Courses are arranged leading to the degree of Doctor of 

 Public Health, Doctor of Science in Hygiene and Bachelor of 

 Science in Hygiene. The details in regard to the requirements 

 for matriculation in thesecourses aredescribed in the catalogue 

 of the School, which will be forwarded upon application. 



A Certificate in Public Health may be awarded to qualified 

 persons after one year of residcDt study. 



An intensive course, comprisiDg conferences, demonstra- 

 tions and laboratory work and designed to meet the needs of 

 Public Health OflBcers, will be given from November 1 to De- 

 cember il, 1920— Fee S50.00. 



For further information address the 



Director of the School of Hygiene and 

 Public Health, Johns Hopkins University 



310-312 Weit MonomeDt St. BALTIMORE, MD. 



Marine Biological Laboratory 



Woods Hole» Mass. 



INVESTIGATIOPI 



INSTRUCTION 



Jmktt SO to August 10, 



SUPPLY 



DEPARTMENT 



Opem the Entire Year 



Facilities for resoach in Zoology. 

 Embryology, Physiology and Bot^ 

 any. Seventy -six privato 1 abora- 

 tories, $100 each for not over three 

 months. Thirty tables are avail- 

 able for beginners i n research who 

 desire to wtirk under the direction 

 of membera of the staff. The fee 

 for such a table ia S50.00. 



Courseg of laboratory instruction 

 with lectures are offered i n Inverte- 

 brate Zoology, _P;otozoology, Em- 

 bryology, Physiology and Alorph- 

 ology and Taxonomy of the Algae, 

 Each course requires the fiill time 

 of the student. Fee,S50. A lecture 

 course on the Philosophical Aspects 

 of Biology and AUied Sciences is 

 also offered. 



_Ammals_ and plants, preserved, liv- 

 i ng, and in embryonic stages. Pre- 

 served material of all types of 

 animals and of Algae, Fungi, Liver- 

 worts and Mosses furniSied for 

 classwork, or for the museum. Liv- 

 ing material furnished in season as 

 ordered. Microscopic slidesin Zool- 

 ogy, Botany, Histology, Bacteriol- 

 ogy. Price lists of Zoological and 

 Botanical material and Micioscopic 

 Slides sent on application. State 

 which is desired. For price lists and 

 alii nformation regarding material, 

 address 



GEO. M. GRAY, Curator, Woods Hole, Mass. 

 Theannualannouncement will be sent on application to The 

 fiireotor, Marine BitJogical Laboratory, Woods HoIe» Mass. 



Cameras 



Lenses 



for Naturalists 



Graflex, Kodak, Foreign Cameras, Zeiss, 

 Goerz, Coolte, and all other high grade JLenses 

 and Motion Picture Cameras. Save 25% to 50%. 



CLitt Oitr PrirA Write at once for Com- 

 ViCl. V/ur Mr ikc ^j^^^ Catalog and month- 

 ly Bargain List. Experts on equipping expedi- 

 tions for still or Motion Picture work. Write 

 today to Graflex Headquarters of America. 



CAMERA COMPANY 



109 E. Dearborn St. Cliicago, UL 



BASS 



When m the market for anything 

 in the line of 



Chemical Glassware, 



Thermometers, 



Hydrometers and Laboratory 



Supplies 



Let us give you our 

 quotations 



Our Catalog gladly sent upon 

 request 



Scientific Utilities Co., Inc. 



Hanafactnreri, Importers, Exporters 



Factory: 84 East 10th Street 

 Office: 18 East 16th Street 



NEW YORK, N. Y. 



U. S. A. 



The University Laboratory 

 D^igners 



ALEXAXDKK SMTTEi, THOMAS B. FREAS, 



President Chief De^eaai ssd Tntmi 



W. L. ESTABBOOKK, W. A. BOBIKG, 



Gen. Manager and Sec'y. ConsnltiBg Aidiitact 



This firm is prepared to offer consultation, 

 advice, report and design on chemical lab- 

 oratories. Oxnplete plans may be offered 

 or work may be done jointly with institu- 

 tional architect. Consultation with archi- 

 tects needing expert advice in laboratory 

 construction is solicited. Send for booklet. 



OfHce : 52 VanderbSt Aveanc, New York Qty 



