1887.] 
Mr A. Scott on some Vapour Densities. 
411 
Series I. — Apparatus filled with hydrogefi, which tended to escape 
when the substance was introduced, and so give too high a 
number for the molecular weight ; coarser balance used. 
Molecular 
•030 sodium 
gave 23‘3 c.c., at 0° C. and 760 mm. pressure, 
giving 28*7 
•035 
9 5 
,, 23'6 ,, ,, 
9 9 
„ 331 
•037 
5 5 
,, 30 ‘4 ,, ,, 
9 9 
„ 27-1 
•033 
9 5 
„ 27-9 ,, 
99 
„ 26*4 
Mean for sodium, 28 '8 
Series 
II.- 
-Same arrangement, but 
the apparatus 
filled with 
nitrogen. 
Gram. 
Molecular 
weight. 
029 
sodium 
gave 
26 - 8 c.c., 
at 0° 
C. and 760 mm. pressure, 
giving 
241 
032 
9 9 
> ? 
29-7 „ 
99 
9 9 
9 9 
24-0 
034 
99 
39 
31*2 „ 
9 9 
9 9 
9 9 
24-3 
030 
9 9 
9 9 
27-6 „ 
9 3 
99 
99 
24-3 
032 
9 9 
9 9 
30-5 ,, 
9 9 
9 9 
9 9 
23*4 
029 
9 9 
93 
25-6 ,, 
99 
9 9 
99 
25-3 
024 
99 
9 9 
22-6 ,, 
9 9 
9 9 
99 
237 
026 potassium 
9 9 
13-9 „ 
9 9 
9 9 
9 9 
41-8 
045 
99 
9 9 
251 „ 
9 9 
3 9 
9 9 
40-0 
042 
9 9 
9 9 
21-9 ,, 
9 9 
9 9 
9 9 
42-9 
052 
9 9 
9 9 
28-4 „ 
9 9 
9 9 
9 9 
40-9 
Mean for sodium, 
24-2 
Mean for potassium, 
411 
Series III. -—Same arrangement as Series II. 
Molecular 
Gram. weight. 
•042 sodium gave 
36 ‘9 c.c. at 
d 
o 
O 
and 760 mm. pressure, giving 251 
•026 „ 
21-0 „ 
99 
„ „ 277 
•028 
231 „ 
9 9 
„ „ 26-7 
•036 potassium ,, 
18-2 „ 
9 9 
„ 44-2 
Mean for sodium, 26 ’6 
Series IV. — Same arrangement as above, but the finer balance was 
used in the weighings. 
Molecular 
Gram. weight. 
•046 potassium gave 23 ‘2 c.c. at 0° C. and 760 mm. pressure, giving 44 '2 
'056 ,, „ 27-4 ,, ,, ,, „ 457 
