W. T. BOVIE AND D. M. HUGHES 



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periments, for as will be seen by an inspection of Fig 2, for expos- 

 ures between 6 and 14 seconds duration, with but a single exception, 



Sec. I 2 3 4 5 6 7 8 9 10 I! I^ 13 14 !5 



Fig. 2. Graphic representation of the frequency of cytolysis of Paramecium 

 caudatum as a function of the length of exposure to fiuorite radiation. The per 

 cent of organisms cytoHzed is plotted as ordinates, the length of exposure as 

 abscissae. 



the curve expressing the relation between the frequency of cytolysis 

 and the length of exposure is practically a straight line. That is, 

 within the limits of experimental error, there are just as many organ- 



