Physics and Chemistry. 253 
obtained in a state of purity, as they were all amorphous and could 
not be obtained crystallized.—<Kongliga Svenska Vetenskaps- 
Akademiens Handlingar, Ny Féljd, 1866, 7 vol., 2d half. 
o . 
interest when considered from an atomistic point of view. 
formulas of the triamin and tetramin series are of ‘course to be 
doubled and we should then have for the three chlorids the empiri- 
cal formulas 
6NH,, €r,Cl, Hexamin-chromium chlorid. 
7NH,, €r,Cl, Heptamin-chromium chlorid. 
8NH,, €r,Cl, Octamin-chromium chlorid. 
Adopting Blomstrand’s view of the constitution of the analogous 
platinum and cobalt compounds, these three bodies may be written 
follows: 
w. & 
[ Vote-—The compounds described by Cleve are of especial 
e 
‘-NH,-Cl -NH,-Cl -NH,-Cl 
-NH,-Cl -NH,-Cl NHC 
=} -NH,-Cl "| -NH,-Cl = | -NH,-NH,- 
©) Hcp ©24 _NH°-NH,-Ol, ©?) —NH;-NH,-CP 
-NH,-Cl -NH,-Cl -NH, 
-NH,-Cl -NH,-Cl -NH,-Cl 
Cleve suggests that the heptamin series may be only double salts 
of his tetramin and triamin compounds, and in view of the 
of variable atomicity supported by the writer.* 1 
occurrence of two atoms of water in all the octamin compoun 
K,8,Pr'S, Pr'S }PUB, 
and points out its analogy to a copper salt described in a previous 
a The new compound forms small, hard, sharp 
0 six-sided tables of a blue gray fag ee stron 
Without the slightest evolution of sulphuretted hydrogen, the | 
product of —- being sesqui-sul id of platinum et 
platinous sulpho platinate PtS, PtS.. is is a steel gray cry 
* This Journal, vol. xlix, p. 108. 
