108 Scientific Intelligence. 
Gay Lussac and Mariotte. This explanation agrees with Wiill- 
ner’s experiments, according to which the “washing out” of the 
bands occurs in the cases of oxygen and nitrogen, under much 
lower pressures than in the case of hydrogen. Pogg. Ann., 
CXXXIXx, p. 465 
3 
onic 
crystals, The new salts, respectively FICI,,6 Cl+4aq. and 
FICI,,6NH,Cl+-4aq., form large colorless transparent crystals, 
whi inati dodeca- 
hich resemble combinations of the cube, octahedron and ca 
hedron, but which really belong to the square prismatic system. 
ey are not decomposed by water, even o ro- 
tint is the more intense the greater the quantity of acid present. 
Stannous chlorid instantly reduces under these circumstances cu- 
pric chlorid to colorless soluble cuprous chlorid. 
