BIOLOGY 



LIBRARY 



6 



GENERAL 



Copyright, 1908, 

 By THE MACMILLAN COMPANY. 



Set up and electrotyped. Published July, 1908. Reprinted 

 October, 1908; February, September, 1909. 



KottoooS $rrS3 



J. S. Crashing Co. — Berwick & Smith Co. 



Norwood, Mass., U.S.A. 



