INFLUENCE OF SIZE OF WOUND 95 



important variations in a certain coefficient K^ connected 

 with a by a relation such as 



interfered very little with the accuracy of the calculation of the 

 entire formula. 



This result was obtained by plotting on squared paper the 

 values of a as ordinates. These values were computed from the 

 formula: 



The time T was plotted as abscissae. 



We thus obtained a curve expressing the law of divergencies 

 between the formula 



and the formula 



Now this curve (Fig. 23) is simply a perfect parabola 

 answering the classical equation y'^=2px^ {y=T and x=oi\ 

 which is equal to saying that 



a = — - 

 2p, 



And in consequence the general equation of the curve became 



S=S,e~''^'''''P^ (6) 



It was possible from now on to calculate directly the area of 

 a wound at any date. To obtain the date of complete cicatriza- 

 tion, it sufficed to solve the equation making S=o-^^ as a 

 wound of 0*4 square centimetres cicatrizes in less than twenty- 

 four hours. 



The two coefficients K and p were bound to the index of 

 cicatrization i by simple relations, and one could either calculate 



