GROWTH AND ASEXUAL GENESIS. 447 



after see, it cannot be, we may unhesitatingly assert its 

 average truth. That the smallest organisms habitually re- 

 produce asexually with immense rapidity; that the largest 

 organisms never reproduce at all in this manner; and that 

 between these extremes there is a general decrease of asexual 

 reproduction along with an increase of bulk; are proposi- 

 tions which admit of no dispute. 



