4229 
In the third column the mean values of the numbers of the second 
column are mentioned; with these numbers the dispersion-curve was 
drawn. 
III and IV. Dewtro- and Laevogyratory Triethylenediamine- 
Cobalti- Nitrate. 
In an analogous way to that of both bromides, the dispersion- 
curves for the other salts were drawn. 
Of the dextrogyratory nitrate a solution was used, containing 
0.2085 gram of the salt in 30.21 grams of water; the numbers of 
the laevogyratory nitrate relate to a solution, containing 0.2534 
gram of the salt in 30.52 grams of water. The specific gravity did 
not differ appreciably from that of pure water. 
The determinations were too uncertain for values of 2 smaller 
than 5085 A.U. 
| Observed Rotation ‚_ Molar Rotation: 10—1 | 
Wavelengths | | 
se. f= Ant en ne ] | Mean value 
in A. U. | Dextrogyra- | Laevogyra- Dextrogyra- | Laevogyra- | 
| tory salt | tory salt tory salt tory salt | 
6600 | + 0°44 — 0°62 + 136%. | — 158% | + 147°7 
Bi) 0.66 | One. WENGE Tee etnies 211.2 
6265 002 [OS eae ra ee mie 279 
2 a es u ended | 362.9 366.2 | 364.5 
5910 1:56 0 22.80. aaa amen Ten 4105 
GE OE VAS (OE ERE en 651.3 596.8 624.0 
5595 2.98 dire ba Dod sms ata 121 sotd 
Bao. >) ezel JON ara 1203.0 | 10830 | 1143.0 
sono ets 1663.0 1447.0 | 1555.0 
V and VI. Dewtro- and Laevogyratory Triethylenediamine- 
Cobalti-lodide. 
The numbers relate in the case of the dextrogyratory salt to a 
solution, which contained 0.1775 gram of the crystallised salt 
(with 1 H,O) in 30.01 grams of water ; in the case of the laevogyratory 
salt, the concentration was : 0.1679 gram of salt to 30.20 grams of water. 
For wave-lengths greater than 6600 A.U. and smaller than 4920 
A.U., almost no light comes through the liquid. 
