45 : 



THE POPULAR SCIENCE MONTHLY. 



the life-history of six of these organisms. These life-cycles cannot be 

 here recounted. Suffice it now to say that each of them multiplied 

 enormously by self-division (fission), but that the life-cycle in each 

 case began and ended in a distinct genetic product call them what we 

 choose spores, germs, or ova. 



,'* v .,' v **" " r . 



Fig. 2. 



I have drawn from Nature, in the six respective cases, the con- 

 dition presented by each organism at the time of emitting its spores. 

 Fig. 1 is the genetic product of an oval monad, with a pair of 

 flagella ; it rapidly increased by fission ; then in a remarkable man- 

 ner a pair blended, became one in the form of a sac, the sac burst 

 and poured out, as the drawing portrays, innumerable spores, which 

 were watched continuously until they were seen to develop into the 

 parent condition. Fig. 2 gives a similar product of another form, dif- 



6 C 



e f 





P 



a 'd <= i L i 



'. <L 



ferent anatomically and in all the details of metamorphosis, but yet 

 passing through the states of fission, blending into a sac, and (as seen) 

 the emission of spores ; which were again watched into the parent con- 



