LABORATORY DIRECTIONS 



IN 



PEINCIPLES OF ANIMAL BIOLOGY 



BY 



A. FRANKLIN SHULL 



ASSOCIATE PROFESSOR OF ZOOLOGY IN THE UNIVERSITY OP MICHIGAN 



WITH THE COLLABORATION OF 



GEORGE R. LARUE 



ASSISTANT PROFESSOR OF ZOOLOGY IN THE UNIVERSITY OF MICHIGAN 



ALEXANDER G. RUTHVEN 



PROFESSOR OF ZOOLOGY AND DIRECTOR OF THE MUSEUM OF ZOOLOGY 

 IN THE UNIVERSITY OF MICHIGAN 



PETER O. OKKELBERG 



ASSISTANT PROFESSOR OF ZOdLOQT IN THE UNIVERSITY OF MICHIGAN 



AND OTHERS 



FIRST EDITION 

 SECOND IMPRESSION 



McGRAW-HILL BOOK COMPANY, INC 



NEW YORK: 239 WEST 39TH STREET 



LONDON: 6 & 8 BOUVERIE ST., E. C. 4 



1919 



