28 Proceedings of the Koyal Society of Edinburgh. [Sess. 
The polarimetric results were as follows : — 
Solvent . . 1 
1 
Water. 
W ater. 
Formamide. 
Graph . . j 
X 
+ 
Concentration 
grams in 100 
c.c. solution. 
1 2-606 
4-512 
2-3984 
Time. 
Time. 
Hi?. 
Time. 
[-fl 
64 
min. 
+ 172-68° 
9 min. 
+ 167-98° 
10 min. 
+ 185-75° 
10 
165-39 
124 
55 
158-80 
16 
55 
184*49 
12 
161-55 
15“ 
55 
154-03 
23 
55 
183-87 
19 
150-99 
18 
55 
149*38 
26 
55 
183-04 
25 
?? 
142-36 
22 
55 
143-73 
29 
55 
182-83 
33 
134-69 
27 
55 
137-85 
33 
55 
181-58 
40 
55 
128-93 
32 
55 
133*20 
39 
55 
180-54 
54 
55 
121-26 
39 
55 
127*66 
46 
55 
179-08 
58 
55 
119-15 
44 
55 
124*33 
53 
55 
177-41 
1 hr. 19 
55 
113-01 
50 
55 
121-12 
1 hr. 
1 
55 
175-53 
1 „ 30 
55 
110-91 
57 
55 
118-13 
1 
55 
10 
55 
173*45 
1 „ 50 
55 
108-98 
i: 
hr. 
5 
55 
115-02 
1 
55 
26 
55 
170-32 
2 „ 56 
55 
106-48 
1 
5) 
15 
55 
112-36 
1 
55 
46 
55 
166-78 
3 „ 13 
55 
105-91 
1 
28 
55 
110-04 
2 
55 
4 
55 
163-03 
4 „ 16 
55 
105-91 
1 
31 
55 
109-70 
2 
55 
34 
55 
158-65 
22 „ 30 
55 
+ 105-91 
1 
5) 
46 
55 
107-93 
3 
55 
155-31 
2 
5) 
5 
55 
106-82 
3 
55 
56 
55 
148-93 
K = 0-0134. 
3 
7 
55 
105-82 
4 
55 
41 
55 
143-64 
Calc, initial raln = 
4 
J5 
30 
55 
105-82 
5 
55 
16 
55 
140-30 
CO 
00 
+ 
8. 
5 
•>•) 
15 
55 
105-82 
6 
55 
3 
55 
136-34 
Extrapolated 
initial 
24 
55 
+ 105-82 
23 
55 
44 
55 
117-16 
1 
Wd = 
+ 186°. 
25 
5? 
16 
55 
117-16 
26 
55 
46 
55 
116-53 
!30 
55 
16 
55 
116-53 
i47 
55 
31 
55 
116-32 
52 
55 
46 
55 
116-32 
i74 
55 
31 
55 
+ 116-32 
K = 0-00154. 
Calc, initial [a]}J = 
+ 189-5°. 
Extrapolated initial 
[g]lf=+189°. 
As will be seen from the graphs (figs. 1 and 2), the initial specific 
rotation obtained by extrapolation is about +186° for water, whereas 
the value obtained for it, using Levy’s formula (Zeitsch. ]pliysikal. Chem., 
1895, xvii, 301), 
where and are times from moment of solution till polarimetric readings 
were made, and are the actual polarimetric readings at times \ and 
and <p is the actual reading when constant, is +186'9° for concentration 
2'606. In the formamide solution of concentration 2-3984 the extrapolated 
and calculated specific rotations are +189° and +189*5° respectively. 
