CHAPTER XI 



1879 



MUCH of the work noted down for 1878 reappears 

 in my father's list for 1879. He was still at work 

 upon, or meditating his Crayfish, his Introduction to 

 Psychology, the Spirula Memoir, and a new edition 

 of the Elementary Physiology. Professor H. N. 

 Martin writes about the changes necessary for adapt- 

 ing the " Practical Biology " to American needs ; the 

 article on Harvey was waiting to be put into 

 permanent form. Besides giving an address at the 

 Working Men's College, he lectured on Sensation and 

 the Uniformity of the Sensiferous Organs (Coll. Ess. 

 vi.), at the Eoyal Institution, Friday evening, March 

 7 ; and on Snakes, both at the Zoological Gardens, 

 June 5, and at the London Institution, Dec. 1. On 

 February 3 he read a paper at the Eoyal Society on 

 " The Characters of the Pelvis in the Mammalia, and 

 the Conclusions respecting the Origin of Mammals 

 which may be based on them"; and published in 

 Nature for November 6 a paper on "Certain Errors 

 262 



