Chemistry and Physics. 235 
‘to be 2°358, 2°385 and 2°350 in three SiO Ty the total chlo- 
rine present being 80°5, 81°6 and 78°9, per cent. Hence it can- 
ot be a mixture of NOCI and NOCI.. If : a docile of NOCI, 
ea Cl, then from the above data there would be 3 molecules free 
Cl to 4 molecules NOCI, which would give a vapor density of 
3°049. If a mixture of NOC and Cl, it - would contain 5 mole- 
d. he 
iiinsity. of 2°315, aca taken in ssgneeus on with its content of 
chlorine, 05 per cent, shows it to be a mixture of NOCI and 
Hence Gay Lussac’s chlor-hyponitric acid is a mixture of 
nitrosyl chloride with a varying Laer: of absorbed Breage 
gas.— Liebig’s Ann., cev, 372, Nov., eS 
4. On Mercurie Fulminate and os Dieegiailane ica HE- 
Lor and Viritie have studied the properties and conditions of 
decomposition of mercuric fulminate. Their material was that 
onan in the service and it ae on analysis numbers agreeing 
pee wn pressure an te pag tt ature. As ameano five e experiments, 
one gram gave 234-2 c. c. of gas, theory codaitie 235°8. In 100 
volumes this gas Pela iene HCy and CO, 0°15, CO 65°70, N 32°28 
Has ranean 
ts 
am gave 403°5 seauienteus a quantity of heat which 
spied a the products of the detonation would heat them to 
nearly 4200°. From these data the heat of formation may be 
th “eda C (diamond) +N,+0,+Hg (liquid) =C,N,Hg0O, ab- 
Sorbs 51 4°5 = —62°9, whi i 
ea the tbe resulting from its ene, “acer has two sources: 
carbon and oxygen to form ie in contact with air, more heat 
is evolved because the CO bur o CO,; but the fore ce of the 
explosion i is not increased sheet ce this combustion follows 
_e 
effect is less than before. The pressures sara ee by the explo- 
h i were measured in a special eprouvette ca led a “ crusher,” 
ea grams fulmin the pressure developed was 477 
Wi, 8 per oo centimeter. ith 4°86 grams, 1730 kilos 
ith 7 h Ta9 le 2697 kilos. And with 9°72 ater 4272 kilo- 
