15 



maximum lies at very low temperatures (a continues namely to 

 increase, for ti^ for instance, up to at least 7a ^^^» ^''^ assumption 

 n -^ 1 must be quite rejected. 



As the value 0,08 (about) is found for ^l^a with H,^, the value 



A Q P 



of Rl\ = Vs H : if, would become -^ X 0,08 = 0,045 with n ^ 0,6 



0,64 



(i.e. .^=1^1^ a or a = Vl^s), i.e. T, about 12°, 3 absolute. This is 



very well possible, as we have seen that for H.^ the value of a is 



still increasing up to 16° abs. (from a^ = 370 X 10 '' to aioo ^ 



= 740 X 10-*^ about). What is very remarkable, is the fact that the 



limiting temperature seems to lie so close to the triple point of H^ 



viz. 14° abs.). 



Fontanivent, January 1918. (7o be continued). 



