viii ZOOLOGY FOR MEDICAL STUDENTS 



tone," for the practical reason that line diagrams are more easily copied. 

 So long as examinations retain the place they hold at the present time 

 in university curricula, it may be assumed safely that students will 

 continue to use this method of impressing anatomical facts upon the 

 memory. 



In conclusion, I have to express my indebtedness to three friends and 

 colleagues — to Mr. James Chumley and Dr. M. Taylor, who have read 

 the whole volume in proof, and to Dr. J. S. Dunkerly, who has given me 

 the advantage of his advice and criticism as regards the chapter on the 

 Protozoa. 



J. GRAHAM KERR. 



28th June 1921. 



