SELIG HECHT 



677 



o.zo 



0./5 



I 

 I 



•O 0/0 



I 

 I 



^ o.os 



o 



0.2 



O.4. 



/.2 



Z.^- 



0.6 0.8 /.O 



T/noe — 5ecopc/s 



Fig. 3. Isotherms of the fundamental reaction, L-^T, oi the latent period. 

 Up to 21°, the reaction can accumulate without interference 0.10 mol of thermo- 

 labile substance in order to produce a response. Above 21°, the thermolabile 

 substance is inactivated. The circles represent the time theoretically necessary 

 to produce 0.10 mol unhampered. The triangles show the time actually required 

 to produce enough thermolabile substance so that in spite of its inactivation 

 there will still accumulate 0.10 mol of it in the sense organ. The vertical dis- 

 tance between the circles and the triangles gives the amount of thermolabile 

 substance inactivated. 



