866 
PEOFESSOE W. A. MILLEE ON THE PHOTOGEAPHIC 
Table I. [continued). 
Name of substance. 
Thickness, in inches. 
Termination 
of spectrum. 
Eelative 
lengths of 
spectra. 
Chloride of Arsenic (AsCIj)... 
Liquid. 
101-5 
5-0 
Corrosive Sublimate 
Sat. soln. 0‘75 in. 
128-5 
32-0 
Bromide of Sodium 
>9 
144-5 
48-0 
Bromide of Potassium 
99 
144-5 
48-0 
Iodide of Sodium 
99 
114-5 
18-0\ 
Iodide of Potassium 
99 
114-5 
18-0/ 
Cyanide of Potassium 
99 
105-5? 
9-0? 
Cyanide of Mercury 
99 
145-5 
49-0 
Sulphocyanide of Potassium... 
99 
112-5? 
16-0? 
Hydrate of Soda 
99 
131-5 
35-0 ■) 
Hydrate of Potash 
99 
129-5 
33-0 J 
Hydrate of Ammonia 
Sp. gr. 0*945 
170-5 
74-0 
Hydrate of Baryta 
Sat. soln. 0*75 in. 
158-0 
61-5 
Hydrate of Strontia 
99 
150-0 
53-5 
Hydrate of Alumina 
Strength of solution 
146-0 
49-5 
Hydrate of Silica 
not determined. 
152-0 
55-5 
Carbonate of Soda 
Sat. soln. 0*75 in. 
146-0 
49-5 
Carbonate of Potash 
146-0 
49-5 
Iceland Spar 
0*35 
160-0 
63-5 
Bicarbonate of Soda 
Sat. soln. 0-75 in. 
145-0 
48-5 
Bicarbonate of Potash 
142-0 
45-5 
Sesquicarbonate of Ammonia . 
99 
152-0 
65-5 
Boracic Acid 
14.3-0 
46-5 
Borax 
99 
158-5 
62-0 
Phosphoric Acid 
99 
117-5? 
2 l -0 
Phosphate of Soda (HO,! 
Solution of 60 i 
156-5 
60-0 I 
2NaO, PO.) / 
grains of dried [ 
Pyrophosphate of Soda, 1 
salt in 1 oz. of f 
2NaO, PO5 / 
water. J 
156-5 
60-0 J 
Triarseniate of Soda (3NaO, 1 
AsO.) / 
Sat. soln. 0*75 in. 
127-5 
31-0 . 
Arsenic Acid 
99 
119-5 
23-0 ^ 
Chlorate of Potash 
99 
145-5 
49-0 
Nitric Acid 
Sp. gr. 1’3 
106-5 
10-0 
Nitrate of Soda 
Sat. soln. 0*75 in. 
112-5 
16-0 
Nitrate of Potash 
99 
112-5 
16-0 
Nitrate of Ammonia 
99 
112-5 
16-0 
Nitrate of Lime 
99 
112-5 
16-0 
Nitrate of Magnesia 
112-5 
16-0 
Nitrate of Baryta 
111-5 
15-0 
Nitrate of Strontia 
111-5 
15-0 
Nitrate of Nickel 
absorbed 
00 
Nitrate of Lead 
111-5 
15-0 
Subnitrate of Mercury 
111-5 
15-0 
Nitrate of Silver 
99 
106-0 
9-5 
Eemarks. 
Spectrum cut off abruptly. 
Spectrum cut off abruptly. 
Spectra terminate abruptly. 
Prepared by Liebig’s process. 
Slightly yellowish. 
From sulphate by precipitation 
with baryta. 
Rather feeble speetrum. 
Crum’s solution. [lution. 
Dialysed from hydrochloric so- 
From ignited bicarbonate. 
Faint beyond 109. 
Equal weights of same salt ; one 
dried at 300° F., the other 
ignited. 
Colourless. 
All the spectra of the nitrates 
are cut off sharply. 
Intense green solution. 
