412 
Proceedings of Royal Society of Edinburgh. [july 18, 
Series IY. — continued. 
r 
Molecular 
Gram 
Weight. 
•059 
potassium 
gave 
25 '0 e.c. at 0° C. and 760 mm. pressure, giving 52 *8 
•052 
9 9 
22*8 „ 
9 9 9 9 
51-0 
•071 
99 
9 9 
35-2 „ 
9 9 9 9 
45-1 
•060 
9 9 
9 9 
30-6 ,, ,, 
9 9 9 9 
43 8 
•023 
sodium 
9 9 
W-2 „ 
9 9 9 9 
267 
•032 
9 9 
9 9 
25-9 ,, ,, 
9 9 9 9 
27 -6 
•035 
9 9 
9 9 
28-5 
9 9 9 9 
27*4 
•029 
9 9 
9 9 
22-0 „ 
9 9 9 9 
29*4 
•033 
9 9 
9 9 
24-6 „ 
9 9 9 9 
30-0 
'119 pot. iodide 
9 9 
14’3 ,, ,, 
9 9 9 9 
185-6 
Mean for sodium, 
28-2 
Mean for potassium, 
47-1 
Series Y. — Same arrangement of apparatus; fine balance. 
Molecular 
Gram. 
weight. 
‘267 mercury gave 
29*3 
c.Co at 
0° C., 
and 760 mm. 
giving 
203-3 
•249 ,, ,, 
27-4 
9 9 
9 9 
9 9 
99 
202-8 
•305 lead chloride ,, 
25-6 
99 
9 9 
99 
9 9 
265-4 
•293 
25-2 
V 
99 
9 9 
9 9 
260-0 
•319 cadmium bromide ,, 
29 7 
9 9 
9 9 
9 9 
9 9 
240-0 
•340 „ „{ 
311 
35-3 
h 
9 9 
9 9 
” { 
244-4 
214-8 
'340 cadmium iodide ,, 
31*2 
9 9 
9 9 
9 9 
9 9 
243 -3 
•411 
35-4 
9) 
9 9 
9 9 
9 9 
259-0 
•162 silver chloride ,, 
22-4 
9 9 
99 
99 
9 9 
161-5 
°191 potassium iodide ,, 
22-4 
99 
99 
9 9 
9 9 
190-5 
"203 ,, ,, 
24-3 
9 9 
9 9 
99 
9 9 
186-7 
•277 mercuric sulphide ,, 
37-2 
9 9 
9 9 
99 
99 
166-6 
The mercury was used to test the apparatus, and indicates that 
the results obtained are a little too high. 
The cadmium bromide seemed to cease giving off gas like the other 
substances, but if the measuring tube be left in position, an additional 
quantity of gas is obtained, most probably from further dissociation 
of the vapour into its elements. The cadmium iodide dissociated 
very largely as indicated by its low vapour density and by expelling 
the vapours, when large quantities of free iodine were observed. 
Silver chloride and potassium iodide volatilised very slowly; the 
vapour of the latter seemed to be free from every trace of free 
iodine. 
