32 
Proceedings of the Royal Society of Edinburgh. 
[Sess. 
Concentration per 
100 grams solvent. 
Mol. weight 
found. 
Mol. weight calcu- 
lated for CgHigOg. 
0-35 
183-0 
180-0 
0-43 
185-8 
0-959 
177-6 
9 ) 
1-453 
172-2 
99 
2-926 
172-0 
99 
The polarimetric figures {cf. figs. 5 and 6) given for water solution corre- 
spond closely with those of Parcus and Tollens (Annalen, 1890, 257, 164). 
The figures for pyridine solution are those of Grossmann and Bloch 
(loc. cit.). 
Solvent 
Water. 
Pyrid 
iiie G. 
and B. 
Formamide. 
Graph 
X 
0 
4- 
Concentration 
grams in 100 
c.c. solution. 
) 
9-097. 
0-5625. 
2-5144. 
Time 
r i 2 o 
L^Jd. 
Time. 
r i20 
L^Jred. 
Time 
7 
min. 
4-102-34° 
10 min. 
4-151-11° 
17 : 
mill. 
4-119-91° 
10 
9 9 
101-07 
20 
99 
145-78 
29 
99 
118-32 
14 
99 
98-31 
30 
99 
142-23 
37 
99 
116-93 
23 
99 
93-00 
60 
99 
133-33 
40 
99 
116-33 
30 
99 
88-75 
120 
99 
127-11 
41 
99 
114-94 
39 
99 
84-29 
180 
99 
122-66 
1 
hr. 
, 7 
99 
112-35 
50 
99 
79-83 
1 day 
97-77 
1 
99 
17 
99 
110-76 
1 hr. 0 
99 
75-80 
2 days 
87-15 
1 
99 
30 
99 
109-17 
1 „ 11 
99 
72-61 
3 
99 
80-00 
1 
99 
44 
99 
106-98 
1 „ 21 
99 
69-64 
4 
99 
78-04 
2 
99 
7 
99 
104-00 
1 „ 31 
99 
67-10 
5 
99 
75-56 
2 
99 
37 
99 
100-62 
1 „ 43 
99 
65-19 
6 
99 
4- 75-56 
3 
99 
50 
99 
94-06 
1 „ 59 
99 
62-64 
3 
99 
54 
99 
93-66 
2 „ 12 
99 
60-73 
4 
99 
13 
99 
91-67 
3 „ 32 
99 
55-63 
4 
99 
37 
99 
89-69 
4 „ 3 
99 
54-78 
5 
99 
87-88 
4 „ 43 
99 
53-72 
5 
99 
20 
99 
86-10 
5 „ 25 
99 
53-08 
5 
99 
48 
99 
83-90 
24 „ 
4- 52-23 
23 
99 
46 
99 
60-85 
24 
99 
20 
99 
60-64 
K = 0-00627. 
24 
99 
46 
99 
60-24 
Calc, initial 
1 — I 
II 
25 
99 
15 
99 
59-65 
+ 108- 
5°. 
71 
99 
15 
99 
57-27 
Extrapolated 
initial 
73 
99 
15 
99 
+ 57-27 
Hd = 
-fl08°. 
K 
= 0-001091. 
Calc. 
initial 
II 
122-7°. 
Initial [o' 
]d from curve 
— 
4-122-5°. 
