THEORY OF REPRODUCTION. 



233 



tion is effected by outflowing processes of the_cell, which have 

 gone a Httle too far. Now, such prioaiti-ve forms of multiphca- 

 tion, gradually becoming i'iTO're''definite, express a predominant 

 katabolism in the unit mass. Reproduction in its simplest 

 forms is associated with a katabolic crisis. 



§ 3. Argument from Cell- Division. — Most unicellular 

 organisms reproduce by cell-division, and this is, of course, a 



Division of an Animal Cell, showing the nucleus (a) in process of forming 

 two daughter-nuclei, showing also the protoplasmic network ib). — 

 From Carnoy. 



precedent of reproduction in multicellular organisms, whether 

 they multiply by asexual budding or by differentiated sex- 

 elements. But in the preceding chapter, following Spencer, we 

 have emphasised the connection between division and a katabolic 

 predominance within the cell. A constructive period may 

 precede, but a disruptive climax attends the division. So far 

 then as reproduction is either wholly included in the process of 



