' a 



14 



Fig. 13. Electron micrograph showing partial destruction of rat fibroblast by virus of 

 eastern equine encephalomyelitis in tissue, culture (From Bang and Gey, 1952) (Magni- 

 fication: X 20,000). 



Fig. 14. Tissue culture of human sarcoma cells by phase microscopy. (Courtesy Stoler 

 and Gey, 1953.) 



Fig. 15. Tissue culture of cells from same line (AF) showing initial stages of cell 

 destruction with poliomyelitis virus. (Courtesy Stoler and Gey, 1953.) 



