210 
Proceedings of the Royal Society of Edinburgh. [Sess. 
/3-d- Galactose. 
/3-cZ-galactose was prepared by a modification of Tanret’s method, for 
a description of which we are indebted to Professor J. C. Irvine. 
The substance thus obtained was found to be partly mixed with 
a-galactose, as shown by its initial specific rotation. The discrepancy in 
the values for K for /3- with those for a-galactose is possibly due to the 
impurity. 
The polarimetric results ( cf . figs. 3 and 4) were as follows : — 
/3-c^Galactose. 
Solvent 
Water. 
Formamide. 
Graph 
(8) 
© 
Concentration 
grams in 100 
> 1-8668. 
1-8064. 
c.c. solution. 
Time. 
MS 
Time. 
[ a ]n. 
12 min. 1 
+ 60-53° 
10 min. 
+ 63-39° 
18 „ 
62-14 
22 „ 
64-22 
24 „ 
63-48 
37 „ 
65-32 
34 „ 
65-35 
50 „ 
66-43 
45 „ 
68-03 
1 hr. 3 „ 
67-54 
55 ,, 
70-44 
1 „ 18 „ 
68-64 
1 hr. 7 „ 
72-05 
1 „ 33 „ 
69-75 
1 „ 22 „ 
7365 
1 „ 50 „ 
71-13 
1 „ 42 „ 
75-00 
2 „ 5 „ 
71-97 
2 „ 2 „ 
7633 
2 „ 25 „ 
7307 
2 „ 27 „ 
77-14 
2 ,, 53 ,, 
74-18 
3 „ o „ 
77-94 
4 „ 15 „ 
76-39 
4 „ 20 „ 
79-01 
4 ,, 50 ,, 
77-06 
5 ,, 15 „ 
+ 79-01 
5 „ 20 „ 
77-78 
Constant 
6 „ 5 „ 
78-88 
23 „ 35 „ 
86-63 
K = 0-007222. 
29 „ 0 „ 
87-19 
Calc, initial 
MS = 
48 „ 0 » 
+ 87-19 
+ 56-51°. 
Extrapolated initial 
K = 0-001 573. 
fal?? = -4-56*5°. • 
Calc, initial 
MS = 
+ 62-30°. 
Extrapolated initial 
[ijg = +62-50°. 
