W. T. BOVIE AND D. M. HUGHES 



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40 



o 



o 20 





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Min. !0 20 30 



50 60 



Fig. 1. Graphic representation of the recovery of Paramecium caudatum 

 from fluorite radiation as a function of time. The per cents of cytolysis are 

 plotted as ordinates and the intervals of time between the two 4 second expos- 

 ures are plotted as abscissae. The curve is a graphic representation of the equa- 

 tion X = Xo^~^\ in which K equals 0.0473, Xo equals the per cent of cytolysis 

 when the time interval is zero, and X the per cent of cytolysis after the inter- 

 vals of time, t. e is the base of the natural system of logarithms. 



