259 



and i)r(st'rv('(l llu-ii- shape of oullinc for hours. These cells 

 looked more like hig rihrohhisls in respect to their spread 

 of cytoplasm and iheii* more os less spindle shape. 



/. The type of medium ami small cells. 



Fig. 63 represents I he type of the smallest observed 



cells found in the Rous chicken sarcoma in vitro. Their 



cytoplasm were very granulated and the nucleus could not 



he distinguished in the living cells. These cells were ex- 



6 7 8 9 



Fig. 63. 

 Ttie type of the small cells in the Rous's chicken sarcome. 



tremely lively in movement. Broad tongue-like and fine 

 filifoi-m pseudopods were pushed out and retracted. Several 

 filiform pseudopods could he seen put out at the same 

 lime and were observed to move like cilia, i. e., the move- 

 ment, which the extreme point of the pseudopods described, 

 was circular, concentric to the axis of the cell, figs. 63^. 

 63^, 63g. 



In fixed and stained preparations, these cells looked 

 as shown semi-diagrammatically in fig. 64. The cytoplasm 

 took up the stain, x\zur II and methylene-blue, very inten- 

 sively. The nucleus or nuclei, sometimes there were several, 



17* 



