A3KWX m . ^ 



American Mature ^eneg 



Group IV. Working with Nature 



SHELL-FISH INDUSTRIES 



- 



BY 



./ 



JAMES L. KELLOGG 



PROFESSOR OF BIOLOGY IN WILLIAMS COLLEGE 



'HOB of „ 



ILLUSTRATED 



try 



NEW YORK 



HENRY HOLT AND COMPANY 

 1910 



