No. I.] SPERMATOGENESIS OF BATRACHOSEPS. 69 



Reconstitution of the chromosomes and a period of growth. 



Equation division of the chromosomes by homoeotypic 

 mitosis. 



Confluence of the chromosomes. 



Reconstitution of the chromosomes and a period of growth. 



Some of these stages are more composite than others and 

 include several more or less distinct processes, all of which will 

 now be considered together. For convenience' sake and for 

 greater clearness I have for each one of them adopted distinct 

 names, under which they will now be referred to. As these 

 stages also mark the principal stages in the evolution of the 

 nucleus, the same names will be used for the various stages in 

 the evolution of the nucleus. It must be remarked that while 

 the radiosomic process in a general way goes hand in hand 

 with the chromosomic process, the various substages of each 

 do not always meet in the same nodes. Thus, for instance, 

 while generally the contraction of the cell wall begins before 

 the confluent umbrella stage in the auxocyte, it may also be 

 delayed until the end of this stage. This shows even more 

 conclusively that the two processes are, to a great extent, 

 independent of each other, and that they only meet in order 

 to perform jointly the mitosis of the chromosomes. 



A. The CJiroviosoniic Process in the Polymorphous 

 Spermatogon ia . 



Perfect Resting Stage. — In this stage the chromioles are 

 spread over the polymorphous nucleus and generally separated 

 one from the other, though they are connected by linin threads, 

 forming winding lines all through the nucleus. These lines 

 are not yet connected with the chromoplasts, which lie free in 

 vacuoles, only surrounded by linin. There are from one to 

 several linoplasts (Figs. 1-3). 



Imperfect Resting Stage. — The threads of linin with the 

 chromioles connect with the chromoplasts and form leaders. 

 The chromioles begin more and more to approach each other, 

 and to form small chromomeres with two or three chromioles 

 in each (Figs. 8, 9). 



