’ Chemistry and Physies. 147 
value, since the double molecule produces no more effect than the 
single one. If the maximum molecular depression be divided by 
the molecular weight of the solvent, the quotient expresses the 
depression produced when one molecule of the substance is dis- 
solved in 100 molecules of the solvent. This value is for formic 
acid 0°63, for acetic acid 0°65, for benzene 0°64, for nitrobenzene 
0°59, and for ethylene dibromide 0°63 ; being practically the same 
for all. For water however, the value is 2°61, a value four times 
too large. This the author explains by the hypothesis that the 
; emical molecul 
physical molecule of water consists of four ch es. 
finally as follows: If one molecule of any substance be dissolved in 
100 molecules of any liquid, of a different nature, there is produced 
about the same and approaches very near the value 0°63. Jonse 
quently, the depression of the freezing point of a dilute solution, of 
whatever sort, is sensibly equal to the product which is obtained by 
n subsequent papers, Raoult considers the application of this 
law to the study of the distribution of acids and bases in ae 
and of the freezing point of acid and alkaline solutions. Wit 
Acids and bai 
is produced, as Vincent has shown, a large quantity of trimethyl- 
amine; one establishment at Courriéres producing 1800 kilo- 
potassium chloride at 23°, until potassium bicarbonate, represent- 
ing nearly 40 per cent of the chloride, was precipitated. These 
