Chemistry and Physics. ‘ 419 
“the same time show that—as also formerly advanced by him—equiva- 
lent weights of oxygen and hydrogen. may replace eagh other in fluid 
compounds without a sensible change of volume. 
food-spirit C2HsO2 = = 42-3 | Acetic acid CsHsOu 63°5 
_ Formic acid C2H2@4 418 | Formate of methyl CsHsO:z 63-1 
Formate of ethy! CcHsOs 84-7 | Butyric acid CsHsO 106.7 
Acetate of methyl = 83°9 | Acetate of ethyl CsHsO4 107-4 
Amylic alcohol C1oH1202 123°3 | Anhyd. acetic acid CsH6Os 109-9 
Buty’e of methyl C1oH#eO4126°3 | Buty’te of ethyl] C12H1204 149-7 
62-2 6 
Alcohol CaHsOz2 Valerate of methyl “ 149: 
@ comparison of ihe specific volumes taken at temperatures equidis- 
i tant from the boiling points leads to t ame results though with less 
little connection with each other. The author next investigates the 
questions whether the specific volume of the same elements is to be 
xe-+-yhtzo where c, h and o represent the specific volumes of car- 
bon, hydrogen and oxygen in such compounds at their boiling points. 
~ while C1oH1002=126-3. Hence the author infers that in comparing 
the specifie volumes of liquids, only the spaces filled by the true equiv- 
the theory of Gerhardt that water has the formula H202 (H=1, O=S) 
that the ethers, alcohols and unibasic acids may be considered as 
hydrogen by other radicals. Thus when in water (S. V=18'8 at 
400" C.) an equivalentof hydrogen is replaced by an equivalent of ethyl 
