Chemistry and Physics. 403 
1 Po+% (dU ) 
sor ate, 
and hence for the second factor the expression 
; a+it 4 ‘ 
—+A.p= 2 (c'—c)p. 
dv P Dor % ( 
By substituting these expressions in (2), we have 
(8) dQ=edtp 2+ pds, 
Po:o 
or if we signify the integration 
(4) Q=fcdt+ ok “2_f(c'—<) pd, 
Po-o 
which is the sought equation. It is easy to see also that a deviation from 
the laws of Mariotte and Gay Lussac can be taken into consideration in 
this investigation as easily as in that of Hoppe.—Pogg. Ann. xeviii, 173, 
May, 1856. 
3. On Ozone—Anvrews has communicated the results of a very 
elaborate and extended investigation of this subject, which forms an im 
portant contribution to our knowledge. The author in the first place 
repeated the experiments of Baumert, who arrived at the “Saige oe bese 
m its chemical action. Andrews found, however, that when the car- 
h ; 
ozone, and therefore that this contains no hydrogen. In like manner 
Was shewn that no. water is produced when ozone is decom ry 
4. Prepa , 
directly from the fluorid instead of employing cryolite. The fluorid is 
carbonic oxyd is heated in contact with hydrate of pore gaa of 
Potash is produced, the reaction being represented by the eq 
200 + KO, HO = C2H0s, KO. 
