1887.] Mr A. Scott on some Vapour Densities. 413 
Series YI. — Same arrangement of apparatus. 
Molecular 
Gram. 
•227 chromic chloride gave 
29 "8 c.e. 
at 0° C. and 760 mm., 
giving 
weight, 
170-0 
•100 
9 9 
14*7 „ 
5 9 5 5 
5 5 
152-2 
•120 
59 
18-8 „ 
9 9 9 5 
5 9 
142-5 
•149 manganous chloride 
5 5 
25-0 „ 
5 9 9 5 
5 ) 
133-0 
•142 
55 
241 „ 
5 9 5 5 
9 9 
131-6 
■164 mercuric chloride 
99 
25-8 „ 
5 5 5 9 
5 9 
142-0 
•167 
95 
22-0 ,, 
9 5 5 9 
5 9 
169-3 
*180 mercuric sulphide 
55 
25-3 ,, 
9 5 5 9 
9 9 
1587 
•145 
5 5 
20-2 „ 
5 5 5 9 
5 5 
1601 
*250 mercurous chloride 
95 
28-9 „ 
5 9 5 5 
5 9 
193-4 
•223 
55 
25-6 „ 
5 9 9 5 
5 5 
194-1 
■068 sulphur 
55 
23-2 „ 
9 9 5 9 
5 5 
65-3 
The results of the chromium chloride are not very concordant, 
and may he due to traces of water. The sample used was sublimed 
and raised to a red heat before using ; green oxide was observed on 
the tube for expelling the vapours. Mercuric chloride seems to 
dissociate largely into its elements, as do the sulphide and mer- 
curous chloride. Sulphur was used to check the apparatus. 
Series YII. — Same arrangement of apparatus. 
Molecular 
Gram. weight. 
288 caesium iodide gave 
24'0 c.c., 
at 0° C. 
and 760 mm., 
giving 
268-0 
305 
5 9 
25-7 „ 
5 5 
5 5 
99 
265-0 
270 
59 
22-5 „ 
5 9 
9 5 
5 5 
267-9 
203 rubidium iodide 
5 9 
19-3 „ 
99 
5 9 
5 5 
234-6 
199 
5 5 
201 „ 
5 5 
5 9 
5 5 
221-5 
202 
59 
20-3 „ 
5 9 
9 5 
5 9 
221-8 
185 potassium iodide 
5 9 
22 "5 , , 
9 5 
5 9 
5 5 
183-5 
176 
9 9 
21-9 „ 
5 5 
5 5 
5 5 
179-0 
143 
99 
17-8 „ 
5 5 
5 9 
5 9 
179-3 
196 caesium chloride 
5 9 
23-4 ,, 
5 9 
5 5 
59 
187-2 
157 
5 9 
19-5 „ 
5 5 
9 9 
9 5 
179-5 
175 
5 9 
21-8 „ 
59 
55 
9 9 
178-9 
114 rubidium chloride 
5 5 
18-6 „ 
95 
5 5 
99 
136-9 
121 
9 5 
19-2 „ 
5 5 
9 5 
5 9 
140-4 
130 
9 9 
20-6 ,, 
5 5 
5 5 
5 9 
141-0 
147 silver chloride 
99 
20-5 „ 
95 
5 9 
5 9 
160-2 
The substances in this series were fused before use, so as to be 
perfectly dry. They were also very pure, their equivalents being 
determined by titration with silver nitrate. 
