300 O. HUG AND H. J. SCHLIEP 



passynsky: Are the curves you have obtained exponential? 



HUG : At a high dosage a quasi exponential curve of contraction was obtained. 

 With lower dose rates more sigmoidal curves result (Fig. 5). It is very unlikely 

 that the effects are produced by a one-hit mechanism. 



POWERS : Did you observe any phenomena in the nerve -muscle preparation follow- 

 ing irradiation of the nerve alone ? 



HUG : I did not irradiate isolated nerves without muscle. 



