356 Proceedings of Royal Society of Edinburgh. [sess. 
at different stages of the thickening, hut always at the same 
temperature (167°). The percentages of S ^ found were : — 
10-5 11-6 12*9 14*0 15*1 
The rapid adjustment of this system, when once 167° has heen 
reached, to a state nearly approaching that required for equilibrium, 
involving as it does an acceleration of the endo-thermal action 
S A ->S/x, thus offers a sufficient explanation of the sudden absorption 
of heat at this point. 
( Issued separately 'November 12 , 1906 .) 
