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O. HUG AND H. J. SCHLIEP 



52,800 r/mln 

 26,400 r/min 

 6,600 r/min 

 6,600 r/min 

 3,300 r/min 



20 



40 



60 



80 

 kr 



100 120 140 



160 



Fig. 5. — Diagram of cumulative shortening of leech muscle (aerated with 95 per cent O2 

 and 5 jier cent CO2) under repeated irradiation with various dose-rates. 



E 

 6 



o 



00 



-■o 



26,400 r/min 

 1,650 r/min 

 852 r/min 



10 20 30 40 50 60 70 80 

 kr 



Fig. 6. — Cvimulative shortening of a leech muscle unable to relax under rei)eated irradi- 

 ation with the same dose of (5,000 r, delivered at different dose-rates: 



