ADAPTATION TO PANTOTHENATE DEFICIENCY 



22-30 



Experiment IV (Culture II) 



Mutation rate = 1.12 x 10 per cell per generation 



Counts were made of a number of identical cultures which were not 

 plated, which are as follows: 2.1 x lo'^, 7.9 x lo''', 8.5 x lo'', 

 6.3 X lo"^, and 3.8 x 10*^, with an average of 5.5 x 10 . 



Experiment V (Culture II) 



-9 



Mutation rate = 2.39 x 10 ^ per cell per generation. 



