THE PLAN OF PRESENT WORK 19 



will also be devoted to domestic animals, animal pets, sporting 

 zoology, and animal aesthetics. 



Distribution in Space will be illustrated by typical cases, 

 involving a brief exposition of leading principles. A short 

 account of life as modified by various surroundings will follow, 

 and such subjects as deep-sea, fresh-water, and underground 

 faunas will here receive treatment. 



Distribution in Time will involve a sketch of the ancient 

 life -history of the earth, under which the most interesting ex- 

 tinct forms will, of course, be described. 



The section on Philosophical Zoology will of necessity be 

 chiefly occupied by some account of the Theory of Evolution, 

 and of related matters, such as the question of Heredity. 



