80 PROTISTS AND DISEASE 



into globules and accumulate in the gelatinous nuclear 

 envelope. Finally the nucleolus, save for a few globules, 

 entirely disappears leaving the nucleus as shown in C, 

 which the authors regard as the typical spireme of the 

 8. decipiens. The nucleus shrinks as the spireme threads 

 coalesce to meet in the middle, D. Finally an intranuclear 

 spindle appears, the chromosomes, about three in number, 

 at first forming a cap at each end. The spindle becomes 

 constricted at its middle, E, and the nucleus divides. 



If we compare the nuclear processes just described 

 with those Wager met with in Polypkagus, Fig. 14, it is 

 obvious that the accumulation of granules about the nucleus 

 is a chromidium. 



Other phenomena observed in 8. fulgens, papillatum, 

 and decipiens by F. L. Stevens are detailed in Chapter V. 



Sorus-formation in S. endobioticum. The nucleolus 

 having increased greatly in size lies eccentrically in the 

 nuclear cavity and discharges chromatic granules along 

 linin strands into the cytoplasm, which thus becomes highly 

 chromatic, and a fine cell-membrane is secreted. Granules 

 collect at the upper part of the membrane and over the 

 upper end of the nucleus, Fig. 21, c. The membrane is 

 then dissolved at a pore and first part of the cytoplasm, 

 next more plasm and part of the nucleus, and finally the 

 rest pass out of the membrane into the upper half of the 

 host-cell, d. The nucleus now shows linin-threads, e. 

 Soon an intranuclear spindle with 5 chromosomes is formed 



