E. Frankland on the Source of Muscular Power. 401 
This result was confirmed by the following experiments :-— 
1. Starch was burnt, firstly, in a current of oxygen gas, and 
secondly, by admixture with chlorate of potash and peroxyd 
of manganes 
Heat units epeontt by one J me of starch burnt with 9° , 5 granite 
chlorate of pot: 4290 
Heat units furnished by ai same weight of sipaag burnt i in a stream 
of oxygen gas, 3964 
Difference - - - - 326 
2d. Phenylic alcohol was burnt with i erie of potash, and 
the result compared with the calorific value of this substance as 
determined by Favre and Silbermann. 
Heat pee furnished by. one ome of peeagic alcohol burnt with. 
9°75 grams cep 3 ee 8183 
Heat aniés furnished poe of pienyiie alcohol when burnt 
ith gaseous ox coe i (Pavic and Silbermann), 7842 
Difference, - - : - 341 
These three determinations of the heat evolved by the decom- 
aaalees of 9°75 grams of chlorate of potash, furnishing the num- 
ers 378, 326, and 341, agree as closely as could be expected, 
when it is considered that ¢ all experimental errors are oe 
thrown upon the calorific value of the chlorate of potash. 
‘he mean of the above five experimental numbers w 
eases, deducted from the actual values read off in the following 
determinations. 
It was ascertained by numegous trials that all the chlorate of 
potash was decomposed in the de 1088 grations, and that but mere 
traces of carbonic oxyd were pro 
Joule’s mechanical equivalent of heat was employed, viz., 1 
kilogram of water raised 1° C.=423 meterkilograms. 
The following wale were obtained : 
Actual energy developed by one gram of each substance when burnt in oxygen. 
Name of substance dried asa Sele Liege 
amc su nee 
3 i-| 2d Experi-| 3d Experi- 4th Experi- of force, 
alesis paper one | mk | maar | ane es (Mean,) 
Beef muscle — 
by repeated w: 5174 5062 5195 5088 5103 2161 
ing with a Sg 
Purified albumen, ....) 5009 4987 sun vie 4998 2117 
en Pee eet ices 69 Pie eee Bs 9069 3841 
Hippuric acid, ...... | 5330 5437 ave esws | 5888 2280 
atid: 3 2645 2585 eae vee 2615 1108 
ere eae ee 2121 | 2302 | 2207 | 2197 | 2206 | 934 
4 The speaker showed the combustibility of urea by ree upon asbestos in 
a jar ee gen gas, 
