GENERAL STRUCTURE OF ANIMALS. 25 



these functions dominate the others. These will form 

 the subject of Part I. In Part II we shall treat the 

 first subdivision of the organic functions, viz., the nutri- 

 tive functions, or those which have to do with the con- 

 servation of individual life. There ought to be a Part 

 III, treating of all that assemblage of organs and func- 

 tions concerned with the conservation of the race or 

 species; but this is so vast a subject that it would re- 

 quire a separate treatise. 



