BUNSEN ON THE CACODYL SERIES. 305 
1‘201 grm. oxidized by means of oxide of zinc, yielded 0°8605 
sulphuret of arsenic, of which 0°728 was oxidized by nitric acid, 
and produced 1:0142 sulphate of barytes, and 0°2683 grm. sul- 
phur. The composition of this substance is, therefore, 
lip Ine Ill. Calculated. 
Carbon . C, 10°21 10°76 10°84 10°55 
Hydrogen H, 2°58 2°62 2°61 2°58 
Arsenic . As, Em oar 31°47 32°43 
Iodine. . I eae “oe 55°25 54°44 
100°'17_ 100°00 
The experiments which I made with the view of determining 
the specific gravity of its vapour did not afford any result, in 
consequence of this compound being partially decomposed even 
before it reaches the boiling point, and forming iodide of mer- 
cury. The relation in the condensation will, however, not differ 
from that of the chloride. By assuming the following formula, 
C, H, As, + I = Kd I, the following specific gravity may be 
calculated :— 
4 vols. vapour of Carbon . . . 3°371 
Ree SERVO ET i cokes sid yen, diay) (ORB 2 
2 .. vapour of Arsenic . . . 10°367 
2 .. vapouroflodine .. . 8701 
23°264:4 = 5°816 
8. Bromide of Cacodyl. 
This compound may be obtained by distilling a mixture of con- 
centrated hydrobromic acid with chloride of mercury and oxide 
of cacodyl. It forms a yellow liquid, which does not smoke, and 
agrees in all its characters most perfectly with the chloride. I 
have therefore not considered it necessary to make any analysis, 
as there can be no doubt that its composition is represented by 
the formula C, H, As, + Br = Kd Br. If it be heated with 
water, an oxibromide is formed, which smokes on exposure to 
the air. 
9. Fluoride of Cacodyl. 
This substance can be procured in a similar manner to the 
former. It is a colourless liquid, and possesses the most into- 
lerably nauseous and penetrating odour. It is insoluble in water, 
