68 



is to be seen a ;:iuch DJii£.ller, regularly spherical body, 

 v/hose history I have heen unable to trace. Probably it is 

 of the same na,ture as the nucleolus, since, \/hen the nu- 

 cleolus fragments, as it does a little later, the sT;:aller 

 body is indistinguishable from the other cliro!na,tin masses. 



An appearance frequently seen at this stage lends sup- 

 port to the view that food m^.terial is passed up froi;i below 

 into the tetrasporangium (see YAIvIAITOUCHI , '06b, p. 424). 

 The nucleus v/joicii lies near the strand of cytoplasm con- 

 necting the tetrasporangium v/ith the stalk cell is seen to 

 be surrounded by a mass of food material, v/hich is probably 

 derived from the stalk cell. The other nuclei at the same 

 time lie in clear cj^'toplasm in v/hich little stored food is 

 visible (fig. 135) . 



During the progress of these changes in the nuclear 

 content of the tetrasporangium, the deeply'- staining granules 

 in the cytoplasm disappear, so that by the end of ^tiie first 

 mitosis they are no longer visible. At the same time, the 

 lajTge vacuoles in tlie cytoplasia give place to smaller, more 

 regular ones. 



Cleavage of tlie cytoplasm begins al./ays when tlie four 

 nviclei begin to move to\/ard the centre of the tetrasporan- 

 givun, vjhich happens soon after their formation. The jiaut- 



