SCIENCE— ADVERTISEMENTS 



WANTED — Zoologist for a Mission College in 

 India. Should have a Ph.D. degree and some 

 teaching experience, and must be a Christian 

 with Missionary motive. Opportunity for re- 

 search. Salary sufficient for comfortable living, 

 with free travel to and from India. Apply with 

 full credentials to The Principal, Ewing Christian 

 College, Allahabad, India. 



ENERGETIC PROFESSOR 

 IN ELEMENTARY COLLEGE BOTANY OR 

 BIOLOGY desires to change position. Seven 

 years' teaching experience, M. A., %vorking on 

 Ph.D. Strong teaching personality. Clear pre- 

 sentation of subjects. Students' interest created 

 and developed. Address K, Science, 2619 Grand 

 Central Terminal, New York City. 



SCIENTIFIC PERIODICALS 

 Chemical, Medical and allied subjects. 

 Completa files, volumes and copies; 

 bought and sold. Please send us a list 

 of your wants. B. LOGIN & SON, 29 

 East 2 1 st Street, New York City. 



WANTED 



Formulae and Processes for Chemicals 

 used in the Pharmaceutical Trade. Ad- 

 dress: G, clo Science, Garrison, N. Y. 



REACTIONS OF SOILS 



May be quickly and accurately determined 

 through use of the 



"LAMOTTE" 

 INDICATOR FIELD SET 

 Complete with instructions. $4.25 (delivered) 

 H-Ion concentration of water and solutions 

 quickly and easily determined by the 



"LAMOTTE" 

 H ION COMPARATOR SET 



Complete and ready for use. $9.10 (delivered) 

 Send for Literature. 



LaMotte Chemical Products Co. 



Baltimore. Md., U- S. A. 



AMERICAN JOURNAL OF BOTANY 



Devoted to All Branches of Botanical Science 



Established 1914. Monthly, except August and September. 

 Official Publication of the Botanical Society of America. 



Subscription, $6 a year. Volumes 1-8 complete, $58 

 post free. Single numbers, 75 cents, post free. Prices of 

 odd volumes on request. 



Foreign postage: To Canada, 20 cents; to other coun- 

 tries, 40 cents. 



ECOLOGY 



Devoted to All Forms of Life in Relation to Environment 



Estal^lished 1920. Quarterly. 



Ot^cial Pulilication of the Ecological Society of America. 



Subscription, $4 a year. Back volumes 1-3, $3.50 post free. 



Single numbers, $1.15 post free. 



Foreign postage: To Canada, 10 cents; to other coun- 

 tries, 20 cents. 



GENETICS 



A Periodic^J Record of Investigations in Heredity and 

 Variation 



Established 1916. Bimonthly. 



Subscription, $6 a year. Single numbers, $1.15 post free. 



Foreign postage: To Canada, 25 cents; to other coun- 

 tries, 50 cents. 



BROOKLYN BOTANIC GARDEN MEMOIRS 



Volume One contains ^>3 contributions on genetics, 

 pathology, mycology, physiology, ecology, plant geog- 

 raphy, morphology, and systematic botany. 



38 plates, 41 text figures; 



Price $3.50 plus postage. Weight, 4 pounds. 



Published irregularly. 



Orders should be placed direct with 



The Secretary, Brooklyn Botanic Garden, 



BROOKLYN, N. Y., U. S. A. 



INSTRUCTOR IN 

 BIOLOGY WANTED 



Young man to assist in large classes 

 of College Zoology and to take 

 charge of a small class in Mammalicin 

 Anatomy. Salary moderate but the 

 place offers a good opening to a 

 capable young man who will work 

 and grow. Initiative more important 

 than experience. Opportunity to 

 work for a higher degree. 



The candidate must speak and write 

 English correctly and easily. Those 

 unable to meet this requirement 

 should not apply. 

 Work begins January 1, 1923. 

 Address, wth full educational his- 

 tory and list of persons who would 

 know about your work : 



PROFESSOR OF BIOLOGY, 



University of Colorado, 



Boulder, Colorado 



