I 



BlOLOGt 



G 



COPYRIGHT, tgii, 

 BY THE MACMILLAN COMPANY. 



Set up and electrotyped. Published May, 1911. 



Nnrfoooft \3rtss 



J. 8. Gushing Co. Berwick & Smith Co. 

 Norwood, Mass., U.S.A. 



