CHEMICAL CLOCK 



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concentration increases, following a hyperbolic law. We do 

 not wish to draw any conclusion from this. We simply 



0.20 



10 20 30 40 50 60 70 "80 90 100 



FIG. 30. RELATIVE RATE OF CICATRIZATION AND APPRECIATION 

 OF THE VALUE OF TIME AS A FUNCTION OF THE AGE 



wanted to recall this classical example so as to remind one 

 that chemical phenomena obeying this law exist. 



This concordance between a curve obtained by quantitative 

 experiments on the cicatrization of wounds, a curve which 



