necessity of reprinting them in a volume form. Works in exchange for 

 the Milnes Marshall Zoological library and the library of the Botanical 

 department will at all time be gratefully received. 



We cannot allow this opportunity to pass without expressing our 

 sense of the loss to Biological science by the death of our friends, 

 Dr. Pollard and Mr. Hick. It was with a heavy heart that we read 

 the proofs of their last contributions to Science. 



SYDNEY J. HICKSON. 

 F. E. WEISS. 



Owens College, 



December 4th, 18U9. 



