15 



tors for the cuUivation oT nuilignaiil tissue cells. 

 'I'lie li'eliiii(|ue for the indefiniti' cullivalion of llie 

 I^ o u s cliiekcn sarcoma in vitro. Histological exami- 

 nation of llie cultures of sarcoma. Tlic al:)ility of 

 tlie sarcoma cells to transform the constituents of 

 serum to protoplasma of their own. Ahilignity of the 

 cultures of chicken sarcoma, liiological cliaracteristics 

 of tlie sarcoma-cells in vitro. The ability of the 

 sarcomatous tissue cells to divide when isolated 

 as single individuals. Morphological and physiological 

 description of different types of sarcoma cells. The 

 type of the medium sized and small cells. The 

 type of big ameboid cells. The type of spindle-shaped 

 cells. Amalgamation of malignant cells. Separation of . 

 cells from the sarcoma cells. Summary of the biolo- 

 gical characteristics of sarcoma cells compared with 

 that of normal fibroblasts. Study of the harmful 

 influence of sarcoma cells directly on normal fibro- 

 blasts. Contamination of cultures of fibroblasts with 

 a few sarcoma cells. Sarcoma cells and the intestinal 

 organism. The mechanism of malignity. 



B i b 1 i o g r a p li y 277 



Index 310 



