1 2 || 



be d * H 



1^1% 



O ^ *** en J? 



0.2 "5 -g g 



a -5 ^|| 



C3 ^3 V O 



ll-s 



.2 1" 8 ? 



* -r* 



5 * ^ 



6 2.> 



a) p, C 



FIG. 3. Classification of substances and agencies operative in cell stimulation 

 and resistance. 



88 



