302 BUNSEN ON THE CACODYL SERIES. 
The weak acids have no action on this substance, but sulphuric — 
and phosphoric acids, on the contrary, disengage muriatic acid. 
The analysis of this substance can only be accomplished by 
means of chromate of lead, as the combustion with oxide of cop- 
per is interrupted by sudden imperfect decompositions. 
I. 0°7165 grm. of substance yielded 0:4620 grm. carbonic acid, 
and 0°282 grm. water. 
II. 0°947 grm. of substance yielded 0°602 grm. carbonic acid, 
and 0°374 grm. water. 
0:3405 grm. of this substance yielded 0°308 grm, chloride of 
silver, and 0°06 grm. was obtained. in addition by burning the 
filter. If we allow the deficiency to be arsenic, we obtain the 
following results :— 
ie II. Calculated. 
Carbon . . C, 17°83 17°57 17:32 
Hydrogen H, 4:37 4°34 4:24 
Arsenic . . As, mss 53°34 
Chlorine . Cl 22°90 25°10 
100°00 
The small deficiency of chlorine arises from the presence of a 
small quantity of the chloride of oxide of cacodyl, which cannot 
be entirely separated. 
The following are the details of the estimation of the vapour: 
Substance Stone 0°414 grm. 
Volume et ane - 20Gl: 
Mercurial pressure of the ap co- ee 
lumn to ie deducted a AG Hats, 
Mercurial pressure to be deducted. 8°5 ... 
Temperature . 117° centig. 
Barometer 332 lines. 
The specific gravity eiicilited onl the above is therefore 
4°56, which corresponds with 
4 vols, Carbon Sort 
12 Hydrogen 0°825 
2 Arsenic : 10°365 
2 Chlorine . 4°880 
19°441:4 = 4°86 
The constituents are condensed in the 
4; 
same way as in the. 
cyanogen compound, for one measure of the vapour of cacodyl 
is united with one measure of chlorine without condensation. 
SY Sere 
