292 MESSRS. THOMAS MARTIN LOWRY AND PERCY CORLETT AUSTIN 
Table IV.—Molecular Rotatory Power of Tartaric Acid in Aqueous Solutions (Observed 
and Calculated). 
e = proportion of water present. 
[M] = molecular rotation observed. 
[MJ = molecular rotation calculated. 
1 
e. 
A. 
Cd 
6438 
Na 
5893 
Hg 
5790 
Hg 
5769 
Hg 
5461 
Cd 
5086 
Cd 
4800 
Cd 
4678 
Hg 
4358 
0-45 
[M] 
[MJ 
[M]—[MJ 
9-005 
9-028 
-0-023 
9-751 
9-730 
+0-021 
9-849 
9-819 
+0-030 
9-866 
9-834 
+0-032 
9-919 
9-919 
9-352 
9-414 
-0-062 
8-022 
8-143 
-0-121 
7-108 
7-204 
-0-096 
2-772 
2-772 
0-50 
[M] 
[Mi] 
[M]—[MJ 
10-100 
10-106 
-0-006 
11-049 
11-041 
+0-008 
11-198 
]1-183 
+0-015 
11-230 
11-210 
+0-020 
11-479 
11-479 
11-218 
11-251 
-0-033 
10-171 
10-249 
-0-078 
9-362 
9-445 
-0-083 
5-446 
5-446 
J- 
0-55 
[M] 
[MJ 
[M]—[MJ 
11-132 
11-117 
+0-015 
12-328 
12-281 
+0-047 
12-497 
12-477 
+0-020 
12-519 
12-514 
0-005 
12-967 
12-967 
13-003 
13-028 
-0-025 
12-225 
12-307 
-0-082 
11-560 
11-655 
-0-095 
8-132 
8-132 
0-60 
[M] 
[MJ 
[M]-[MJ 
12-109 
12-107 
+0-002 
13-514 
13-484 
+0-030 
13-742 
13-726 
+0-016 
13-776 
13-775 
+0-001 
14-391 
14-391 
± 
14-676 
14-699 
-0-023 
14-144 
14-223 
-0-079 
13-584 
13-684 
-0-100 
10-538 
10-538 
0-65 
[M] 
[MJ 
[M]—[MJ 
13-092 
13-079 
+0-013 
14-699 
14-667 
+0-032 
14-963 
14-959 
+0-004 
15-021 
15-016 
+0-005 
15-798 
15-798 
± 
16-314 
16-360 
-0-046 
16-071 
16-129 
-0-058 
15-640 
15-712 
-0-072 
12-956 
12-956 
0-70 
[M] 
[MJ 
[M]—[MJ 
14-003 
14-004 
-0-001 
15-750 
15-788 
-0-038 
16-129 
16-124 
+0-005 
16-180 
16-192 
-0-012 
17-126 
17-126 
± 
17-890 
17-919 
-0-029 
17-788 
17-912 
-0-124 
17-490 
17-606 
-0-116 
15-197 
15-197 
± 
0-75 
[M] 
[MJ 
[M]-[MJ 
14-829 
14-846 
-0-017 
16-811 
16-817 
-0-006 
17-222 
17-196 
+0-026 
17-302 
17-274 
+0-028 
18-355 
18-355 
1 
+ 
19-355 
19-376 
-0-021 
19-547 
19-593 
-0-046 
19-453 
19-400 
+0-053 
17-356 
17-356 
br 
0-80 
[M] 
[MJ 
[M]—[MJ 
15-685 
15-693 
-0-008 
17-924 
17-854 
+0-070 
18-295 
18-275 
+0-020 
18-370 
18-361 
+0-009 
19-592 
19-592 
± 
20-849 
20-845 
+0-004 
21-243 
21-287 
-0-044 
21-077 
21-208 
-0-131 
19-535 
19-535 
ib 
0-85 
[M] 
[MJ 
[M]—[MJ 
16-570 
16-595 
-0-025 
18- 963 
19- 045 
1—0-082 
19-423 
19-412 
+0-011 
19-469 
19-507 
-0-038 
20-888 
20-888 
± 
22-283 
22-369 
-0-086 
22- 945 
23- 030 
-0-085 
23-039 
23-060 
-0-021 
21-730 
21-730 
± 
i 0-90 
! [M] 
. [MJ 
[M]-[MJ 
17-467 
17-423 
+0-044 
19-956 
19-966 
-0-010 
20-530 
20-474 
+0-056 
20-530 
20-577 
-0-047 
22-109 
22-109 
-I- 
23-784 
23-824 
-0-040 
24-670 
24-719 
-0-049 
24-837 
24-869 
-0-032 
23-928 
23-928 
0-95 
[M] 
[MJ 
[Mj-|MJ 
18-314 
18-333 
-0-019 
21-105 
21-105 
+ 
21-790 
21-666 
+0-124 
21-790 
21-781 
+0-009 
23-504 
23-504 
± 
25-561 
25-527 
+0-034 
26-883 
26-742 
+0-141 
27-226 
27-058 
+0-168 
26-687 
26-687 
The highest number in each series of molecular rotations is shown in heavy type ; the wave-lengths 
at which the true maxima occur are shown in Table V. 
