Physics and Chemistry. 109 
acids, the formulas bein 
€,H, PO PO €,H, 
©,H,)>0,, PO +O, €,H, > @,, €,H,@,:}'O,. 
H, H, H H 
compares this body to pyrophosphoric, phosphoglyceric, and citroglyceric 
being | 
A second compound boils at 275° to 285° under a pressure of 10™™ and 
is still more viscid. 
35 
Its formula is gus ©,: it appears to lose water by repeated distil- 
Sra Seed | 
lations and to give its first anhydrid 8(€ oH) t O.. 
3 
The author also obtained a colorless oily liquid having the formula 
©. 
His e'H. @,. 
2 
This compound is formed from pyroglycerine by the elimination of two 
equivalents of water. The author terms it meta-glycerine or pyroglycide 
and compares it with Maddrell’s insoluble metaphosphate Te 
Na, - 
i (not. yet obtained) would correspond to Graham’s metaphos- 
phate 
€,H, ) &. to PO 
*A° fae 8, 
while one of Fleitmann’s and Henneberg’s metaphosphates would cor- 
respond to a triglycerine anhydrid 
a ©, to 5€ 8, Q,. 
* 
a 
Eheee parallels. are very interesting and suggestive—Comptes Rendus, 
u, 359, WwW. G 
8. On Ozone 
F.R.S. (Extract of a letter to one of the Editors, Jan. 29, 1860).—The 
ozone is really a modification of oxygen, which Honzeau has shown to 
be identical with the so-called nascent oxygen, which is evolved, together 
ium is decom by sul- 
phuric acid at ordinary temperatures. The spontaneous decomposition of 
Believing that the nitrous acid in the above experiments is not an — 
dental product of electric or catalytic action, but dependent upon the 
formation of active or nascent oxygen, I caused a current of air to 
ew 
through a solution of permanganate of potash mixed with sulphuric 
