30 
Proceedings of the Koyal Society of Edinburgh. [Sess, 
^-Xylose. 
Powdered xylose was dried at 105° till of constant weight. It showed a 
slight yellowish tint and melted at 142-144°. 
The cryoscopic determinations in formamide solution gave the following 
figures : — 
Concentration per 
Mol. weight 
Mol. weight calcu- 
100 grams solvent. 
found. 
lated, C 5 H 10 O 5 . 
0*624 
140*5 
150 
1*205 
145*8 
1*698 
145*2 
The polarimetric results were as follows, those obtained by Grossmann 
and Bloch in pyridine solution also being given (see figs. 3 and 4) : — 
Solvent 
Water. 
Pyridine G. and B.*^ 
Formamide. 
Graph 
X 
0 
+ 
Concentration 
grams in 100 
c.c. solution. 
QO 
1*28. 
4*0404. 
Time. 
[«]?’. 
Time. 
[«]L"d, 
Time. 
8 min. 
+ 69*53° 
8 : 
min. 
+ 92*8° 
11 min. 
+ 103*7° 
10 
55 
67*14 
10 
55 
94*92 
15 
55 
101*9 
12 
?5 
62*73 
12 
35 
96*10 
19 
55 
99*6 
13 
5) 
60*52 
15 
35 
96*50 
33 
55 
91*96 
18 
55 
50*23 
20 
35 
95*32 
40 
55 
89*48 
23 
)) 
44*51 
30 
35 
93*76 
51 
55 
83*90 
25 
JJ 
41*02 
40 
35 
91*82 
62 
55 
79*58 
30 
35 
36*80 
50 
35 
88*78 
75 
55 
74*26 
36 
53 
32*01 
60 
55 
86*34 
87 
55 
70*29 
43 
55 
28*51 
80 
55 
83*22 
1 
hr 
.38 
55 
67*20 
53 
33 
25*02 
100 
53 
82*04 
1 
55 
54 
55 
61*63 
65 
33 
22*09 
120 
55 
81*26 
2 
5) 
5 
55 
59*28 
85 
55 
20*82 
1 
day 
53*13 
2 
j; 
26 
55 
54*57 
1 hr. 42 
53 
19*5 
2 
days 
39*85 
2 
)) 
42 
55 
51*12 
1 „ 55 
55 
19*5 
4 
55 
+ 32*04 
4 
55 
11 
55 
39*35 
2 „ 9 
35 
+ 19*13 
5 
55 
Constant 
4 
55 
20 
55 
38*01 
4 „ 15 
35 
Constant 
4 
55 
29 
55 
36*88 
4 
55 
42 
>5 
36*02 
K = 0*0188. 
4 
55 
59 
55 
34*90 
Calc, initial ral?? = 
5 
55 
19 
55 
33*42 
+ 90*31°. 
5 
55 
35 
55 
32*67 
Extrapolated 
+ 90°. 
1 — 1 
s 
II 
24 
47 
55 
55 
42 
34 
55 
55 
25*25 
+ 25*12 
Constant 
K 
= ( 
3*00306. 
Calc, 
. initial 
1 HS’= 
+ 
109*39°. 
Extrapolated 
II 
+ 
109°. 
* initial^ +117*39°, maximum 122*07°, constant + 40*63°. 
