171 



Table 15. 

 Experiment No. Journ. 110 a (Culture No. 1820 2). 



with the Zeiss phokii apparatus. Every ten minutes an ex- 

 posure was made. Hauffs -Flavin plate" was used. The 

 time of exposure was about 20—30 seconds. 



It was observed several times before, that the process 

 of mitotic cell division lasted 12 minutes in the line of 

 periphery at a temperature of 39 ' C, therefore the ten mi- 

 nutes interval between exposures was employed, in order 

 to get all the cells in the division on the plates. After 

 having made the negatives, the examination of the material 

 was commenced. On the negatives or prints the peripheral 

 cells were systematically examined, i. e. every single ])eri- 

 pheril cell was carefully studied and followed from negative 



