Chemistry and Physics. A13 
greater, in others smaller. With respect to the specific volumes the 
Equivalent quantities of oxygen and hydrogen may replace each other 
without very sensible change of volume: thus the spec. vol. of woo 
is 41 
expression “ The spec. vol. of a liquid C,Hp)O,Qg at its boiling point is 
5'5a-+-5'5b-++6-1c-+-3-9d.” ; 
The symbol O is here used to denote the oxygen outside of the radi- 
cal, and the author computes the spec. vols. of 45 liquids in satisfactory 
accordance with the observations, the difference being never 4 per cent 
of the whole value. The author remarks that the expression above 
given is simply to be regarded as a useful formula of interpolation to 
os tag the relations between the constitution and the spec. vols. 
compounds of the water type H Oz, (2) as replacing carbon within a 
radical, (3) as replacing oxygen within a radical. In the first and sec- 
ond of these cases sulphur has the same spec. volume, namely 11:3: 
but when it replaces oxygen within a radical its specific volume is 
higher, namely, 14-3—14-4. It is remarkable that alcohol and bisul- 
f 4 | i or the compounds 
Next directs his attention to the spec. volumes of inorganic compounds 
Wi iit a es dence between the spec. vols. of the 
fF ptt r ‘ 
Aw MARS VY. 
