Chemistry and Physics. 333 
Total Specific heat Specific heat 
Mixture, Eg specific heat. of the N. of the COs. 
00+0 33349 20°40 20-40 
CO+O04N 2840 24°02 3°36 20°66 
CO+0+N, 2548 26°69 6°27 20°42 
CO+0+4N, 1807 3747 12°67 24:80 
CN, 4862 54 00 10-00 22.00 
C.N,+0,+N, 4082 64°31 7°50 23°40 
C.N,+4N,0 3972 86.71 42°70 22-00 
C=19-1 + 0°0015(T—2000) 
This gives for the elementary specific heat of carbon dioxide at 
2000°,19°1; at 3000°, 22°1 and at 4000°, 25°1. The mean specific 
heat of this gas, therefore, more than triples, and the elementary 
Specific heat quadruples, between 0° and 4300°—Am. Chim. 
Phys. VI, iv, 74, Jan., 1885. G. F. B. 
- On the Action of Hydrogen peroxide on the Hydrates of 
their hydrates. Gela s precipitates were obtained which 
Were washed by decantation, care being taken to avoid elevation 
f €mperature, and in so ses dried over sulphuric acid. T 
Manganate. Hydrogen peroxide gave the same result with both 
these methods; but cerium peroxide gave only half as much 
*Xygen by the first method as by the second. The oxides of 
Yttrium, lanthanum, samarium and di lymiu i, whose formula is 
e same 
formula R,O,, approachi 
5 YY, oaching R,O,. 
mum, RO,, te like uianie acid peroxides of the formula RO,. 
The oxide of thorium, which belongs to the same group ge the 
; h g 
Peroxide R,O,.— Bull. Soe. Chim., U, xiii, 53, Jan., 1885, 
G. F. B, 
4. On the Determination of small quantities of Hydrogen sut- 
Phide in Gaseous mixtures.—For the purpose of peatoclgger the 
