236 W. Gibbs and F. A. Genth 
lished in 1851,* Claudet described with some detail the pro 
ties of the chlorid of Purpureocobalt, and the mode of obtaining 
it, as well’as a few other ammonia-cobalt salts. With the ex- 
ception, however, of more complete analyses, the memoir in 
question contained nothing which is not to be found in the pre- 
viously published paper above alluded to. In two notices com- 
municated to the Academy of Sciencest in the same year, Frém 
announced as his own, the discovery of a class of compoun 
containing cobalt and ammonia, and produced by the oxydation 
of ammoniacal solutions of protosalts of cobalt. In the follow- 
ing year his complete memoir appeared.t In this Frémy de- 
scribes anew the ammonia-salts of protoxyd of cobalt, first ob- 
tained by H. Rose, passes then to the description of two new 
classes of compounds discovered by himself, and named by him 
Oxy-cobaltiaque and Fusco-cobaltiaque, and finally describes at 
some length the principal salts of Genth’s two bases, the consti- 
tution of which he correctly determines. Frémy appears not to 
ive been aware that these two bases had been described in a 
manner little less complete than his own two years before the 
ps oem of his memoir. The chlorid of Luteocobalt and its 
platinum salt have also been described and analyzed by Rogoj- 
ski,§ and what we now term the chlorid of Purpureocobalt, by 
Gregory,| who corrected the analyses of Frémy. 
The researches of Claus on the ammonia-iridium and ammo- 
nia-rhodium bases established the existence of compounds of 
Bioswit ipaanigl TO by Frémy is so simple and con- 
venient that we have adopted and extended it to meet every 
vase. We have, however, considered it desirable to the 
_ * Phil. Mag, ii, 253, and Ann. de Chimie et de Physique, xxiii, 483. 
{ Som xxxii, 509, 808. 
¢ Ann. de Chimie et de Physique, xxv, 257 
Journal fiir praktische Chemie. 
ie und 
| Ann. der Chemie und Pharmacie; Ixxxvii, 125. : 
_§ Bulletin de P Académie de St. Petersburg, 1855, xiii, 97, quoted in Handwor- 
der reinen und angewandten Chemie, vi, 843. 
e 
