400 
5, 
Arsenicumtrichloride: AsCl. | 
v Maximum Pressure H | | 
3 Sinar. | Molecular | 
5 5 RE. tension, in | ha a | Surface- | 
a. in mm. mer- | i energy » in 
5 cury of | in Dynes Site | Erg. per cm?, 
ae, 1.842 2453.8 43.8 2.245 818.4 | 
0 1.708 Zie 41.4 2.205 782.9 
20.8 1.629 2167.2 39.4 2.165 7154.3 
3515 1.601 2134.4 38.0 2.136 134.0 
50.2 1.544 2057.3 36.6 2.105 7113.9 
64.8 1.480 1976.2 Bla! 2.073 691.7 | 
loo 1.445 1924.4 34.2 2.051 678.8 | 
90 1.354 1805.6 32.8 2°016 658.5 
110 1.312 1749.0 31.0 1.968 632.4 
Molecular weight: 181.34. 
The chloride boils at 130°.5 C. under a pressure of 757 mm.; its melting- | 
Radius of the Capillary tube: 0.03636 cm. 
Depth: 0.1 mm. 
point is —13° C. The specific gravity was calculated from the formula: 
dys = 2.2050 — 0.001856 f — 0.0000027 ¢?, derived from the values given in lite- 
rature. At 0° C. the density is: 2,2050; at 20° C. : 2.1668; at 130°.2 C.: 1.9181. 
The temperaturecoefficient of » has a mean value of: 1.40 Erg per degree. 
6. if 
Arsenicumtribromide: 4sBr3. 
v ‘Maximum Pressure H Moteout 
| = 5 Surface- seh be re an 
WE ree, eet. ad tension 7 in | td e i wie 
a. | inmm. mer- 2 gravity d,. energy » 
Br cury of in Dynes Ie 5 Erg per cmt, 
In Lee De | 
| == = ns PSS a ae 
49.6 1.822 2429.1 49.6 3.328 1029.5 
[1455 1.714 22851 46.6 3.261 980.5 
90 1.647 2188.1 44.8 3.234 947.8 
105.5 1.587 2116.9 43.0 3.184 919.3 
121 1.518 2023.8 41.0 3.143 884.1 
‚ 135 1.467 1956.6 39.6 3.111 859.8 
149.6 1.417 1889.1 38.2 3.076 835.6 
*165 1.273 1697.6 37.0 3.041 815.6 
*179.7 1.244 1658.3 36.1 3.008 801.6 
Molecular weight: 314,72. Radius of the Capillary tube : 0,04242 cM.; in the obser- 
vations indicated by *, it was: 0.04583 cm. 
Depth: 0.1 mm. 
Under a pressure of 20 mm. the substance boils at 109° C.; the melting- 
point is 31° C. At 50° C. the specific gravity was; 3.3282; at 75° C.: 3.2623; | 
at 100° C.: 3.1995. At f° C.: d,, = 3.3972 — 0.002822 (f— 25°)-+ 0.00000248 
(t — 25°). | 
The temperature-coefficient of » is up to 120° C. fairly constant; its mean 
value is 2,05 Erg per degree. Afterwards it decreases gradually, and becomes | 
about 0,98 Erg at 180° C. | 
