To 



MY LEARNED AND ESTEEMED FRIEND 



THEODORE NICHOLAS GILL 



I DEDICATE THIS BOOK, 



NOT ONLY 

 As A SLIGHT TOKEN OF MY PERSONAL REGARD, 



BUT ALSO 



To EXPRESS MY PROFOUND APPRECIATION 

 OF 



His genius, and for the power and 

 influence his many works 



have had in 

 advancing the best interests of General Biology. 



