LABORATORY DIRECTIONS 



IN 



PRINCIPLES OF ANIMAL BIOLOGY 



BY 



A. FRANKLIN SHULL 



ASSOCIATE PROFESSOR OF ZOOLOGY IN THE UNIVERSITY OP Jp3HIGAN 



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' )r 



PETER 0. , O&BEBIffei?,. 1 \> j ,% 



ASSISTANT PROFESSOR OF ZOOLOGY IN THE UNIVERSITY* 6F MitHIOAN 



AND OTHERS 



McGRAW-HILL BOOK COMPANY, INC. 



239 WEST 39TH STREET. NEW YORK 



LONDON: HILL PUBLISHING CO., LTD. 



6 & -8 BOUVERIE ST., E. C. 



1919 



