264 Hartiey—The Action of Heat on the Absorption Spectra and 
dark green hexagonal prisms on standing over sulphuric acid. These crystals, 
while extremely deliquescent in air, were efflorescent when standing over sulphuric 
acid, and rapidly became transformed into a black amorphous powder. They could 
not be dried by crushing between blotting paper, as it appeared to form the black 
anhydrous compound on coming in contact with the salt. This is probably a 
combination of the salt with cellulose in a manner similar to that of other chlorides. 
Light was observed to have a distinct action on the substance so that the third 
determination of water in the salt was carried out as far as possible in darkness, 
and the weighings performed in a pair of ground watch-glasses. The nickel was 
determined as oxide, and the iodine as silver iodide. 
The composition of the salt was found to be Nil, .7H,O, and not that usually 
accepted Nil,6H,0. ‘ 
Determination of the Water. 
I. Tae III. 
Weight of salttaken, . . . . . . 2:4053 4°4870 4°3206 
OSS OH WEIMER 6 o o 0 0 0 0 0 Orage 1°3227 1:1850 
Tal) jog CB sn AHI 29°47 27°42 
Of these I. was kept over sulphuric acid, and weighed at intervals during 
eighteen days. 
II. was heated at 100° C. in the steam-oven for ten successive periods of about 
three hours each, the salt cooled in a desiccator freely exposed to the light. 
III. was heated at 100° C. for seven successive intervals of about three hours 
each; at each weighing the salts were enclosed in air-tight watch-glasses, and 
allowed to cool in the dark. 
ANALYSES. 
Determination of the Water. 
Ie II. III. 
Weight of salttaken, . . . . . . 2:4058 4:4870 4°3206 
JLOSS OE WEEM 5 0 60 5 6 0 0 ol} 6MOPOG® 1:3227 1:1850 
151{0) OEP CBillinn 06 «6 0 0 0 0 0 o BBPSiil 29°47 27°42 
Determination of Nickel and Lodine. 
I. Il. III. 
Weight of substance, 2 5 2 3 14055 1:0959 0°5669 
NiO, ro AY Al Le vb 3 US I a O22 OL 0:1866 — 
INT ra soy ci ay ee, od: ay Lhe EC SEE ORL890 0:1466 —_— 
Pere Cem GE IN, 5 o o «0 0 0 «0 o Lexy 13°38 — 
Weight of Agl, eA eG lo MP aa Te _ — 0°6087 
WOEMOM 4 6 o 6 6 6 0 a O _ —_ 0.38289 
Pericenttofae FAC Gao. we dette ee t: — _ 50°02 
