186 Prof. Frankland on the Origin of Muscular Pomer. 



with one gram of the substance burnt in each of the following 

 determinations. This was effected by the use of two copper 

 tubes, the one placed within the other. The interior tube was 

 charged with a known weight of the same mixture of potassic 

 chlorate and manganic oxide as that used for the subsequent 

 experiments, whilst the annular space between the two tubes 

 was filled with a combustible mixture of chlorate and spermaceti, 

 the calorific value of which had been previously ascertained. 

 The latter mixture was ignited in the calorimeter as before ; and 

 the heat generated during its combustion effected the complete 

 decomposition of the chlorate in the interior cylinder, as was 

 proved by a subsequent examination of the liquid in the calori- 

 meter, which contained no traces of un decomposed chlorate. 

 The following are the results of five experiments thus made, 

 expressed in units of heat, the unit being equal to ] gram of water 

 raised through 1° C. of temperature. 



First experiment .... 340 



Second experiment . . . 300 



Third experiment . . . 375 



Fourth experiment . . . 438 



Fifth experiment . . . 438 



1891 

 Mean 378 



This result was confirmed by the following experiments : — 



(1) Starch was burnt, first, in a current of oxygen gas, and 

 secondly by admixture with potassic chlorate and manganic oxide. 



Heat-units furnished by 1 grm. of starch burnt ^1 aqqa 

 with 9*75 gratis, of potassic chlorate . . J 



Heat-units furnished by the same weight of starch 1 oqoA 

 burnt in a stream of oxygen gas . . . J 



Difference ~326 



(2) Phenylic alcohol was burnt with potassic chlorate, and the 

 result compared with the calorific value of this substance as de- 

 termined by Favre and Silbermann. 



Heat-units furnished by 1 grm. of phenylic al-1 ~, oo 

 cohol burnt with 9*75 grms. potassic chlorate, j 



Heat-units furnished by 1 grm. of phenylic alco-1 



hoi when burnt with gaseous oxygen (Favre > 7842 

 and Silbermann) J 



Difference 341 



These three determinations of the heat evolved by the decom- 

 position of 9" 75 grms. of potassic chlorate, furnishing the num- 



