Chemistry and Physies. 143 
ments, Wurtz sought to avoid the dissociation by diffusing the 
vapor of the phosphoric chloride in a space filled with one of the 
products of this dissociation, phosphorus chloride. In this way, a 
series of twelve experiments was made, at temperatures from 160° 
to 175°. The results are as follows, the number of the experiment 
being given in the first line, the density obtained in the second, 
and in the third the tension of the vapor in millimeters of 
mercury : 
ff Meo Om, . OWE aes) & ; ae 
7:25 738 7°74 7:06 7:03 8:30 6°88 716 7°44 6°80 7°00 6°68 
194 388 168 271 343 174 411 394 214 413 318 423 
The mean of these results is 7-226; a number according well with 
the calculated density, 7-217. Hence when dissociation is pre- 
com- 
; is an atomic combination, in which each chlorine 
atom has an equal value, and the equivalence of phosphorus is 
variable.— Compt. Rend., \xxvi, 601, March, 1873. Bull. Soc. 
Ch., Il, xix, 451, May, 1873. G. F, B. 
5. On Ethyl-amyl.—This hydrocarbon was discovered by Wurtz 
CH 
CH’ t CH.-.-CH,---CH,--CH,--CH,. 
160° to 175°; and yielded, on treatment with potassium hydrate, 
4 mixture of two alcohols, one boiling at 146°-148°, the other at 
163°-165°. These were oxidized together, and afforded (1) i 
®nanthylic acid, boiling at 210°-213° ; and (2) methyl-amyl-ketone, 
boiling’ at 143°-145°. Hence the primary alcohol above men- 
_ tioned is isoheptyl alcohol, and the secondary alcohol is methyl- 
G. F. B. 
6. Ona New Synthesis of Aromatic Acids,—Since the alkali- 
alcohols, when acted upon by carbon dioxide, yield fatty acids, 
the phenols thus treated may be expected to give homologues of 
Salicylic acid. So the acetylene series of hydrocarbons, yielding, 
