1059 



When we inquire into this influence it must be admitted that 

 condition (3) alone does not lead to the negative sign in a mathe- 

 matical strict way. I onl)' claimed loc. cit. to make it "highly 

 plausible" that the sign should be negative. 



"■('.) 



If the curve wliich represents iv{t) as function of t, changes its 

 sign only once, and therefore presents a shape of the type of fig. ^, 



the velocity. Finally loc cit. p. 1265 the equation occurs: 



a-c 



ƒ 



w {,'J )d&= - a-. 



which as I indicate there, will be valid for not too small values of /, and which 

 can haidly be reconciled with the supposition jq w (/) = for every value of (. 



