ACTION OF SULPHURIC ACID UPON THE AMIDES AND NITRILES. 
477 
tales strong solutions in white grains. This preeipitation is assisted by the addition 
of a little ether. We have not analysed this body, but we have examined in addition, 
Dlsulphani late of Silver. 
The liquid formed by neutralizing a concentrated solution of the acid with car- 
bonate of silver is precipitated cold by the addition of a mixture of equal volumes of 
alcohol and ether. The salt subsides in colourless crystalline grains; the deposition 
is much facilitated by rapidly stirring the contents of the beaker with a glass rod. 
Disulphanilate of silver crystallizes by spontaneous evaporation of the aqueous solu- 
tion in small laminae which blacken and deposit a black powder when boiled with 
water. 
0 4687 grin., dried at 120°, gave 0‘2134grm. of silver. 
The formula, 
C,,(H,Ag,)N,S,0,„ 
requires 
Theory. 
Experiment. 
t 
A ^ 
12 equivs. of Carbon . . 
. . 72 
15-40 
5 equivs. of Hydrogen . 
. . 5 
1-07 
2 equivs. of Silver . 
. . 216 
46-25 
45-53* 
1 equiv. of Nitrogen 
. . 14 
2-99 
4 equivs. of Sulphur 
. . 64 
13-70 
12 equivs. of Oxygen 
. . 96 
20-59 
467 
100-00 
The researches detailed in the preceding paragraphs may serve to characterize 
more fully a class of compounds of which only a few terms, isolated and scattered in 
very different groups, had been previously observed. The only disulpho-acids hitherto 
known, were Berzelius and Laurent’s disulphonaphthalic acid and Magnus’s 
ethionic (disulphethylic) acid, and lastly, dithiobenzic (phenyl-disulphodiamic) acid, 
recently discovered by M. Kilkenkamp. To these this memoir adds five new acids 
belonging to several of the most important series of compounds. 
Disulphometholic acid . . . H4 S4 0,2. 
Disulphetholic acid . . . . C4 Hg S4 0,2. 
Disulphopropiolic acid . . . Cg Hg S4 0,2. 
Disulphobenzolic acid . . . CjaHg 840,2. 
Disulphanilic acid .... C, 2 H 7 NS 40 , 2 . 
* Although this number is rather low, it marks the composition of the salt sufficiently well, since the acid 
from which it was formed was known to contain traces of sulphanilic acid ; for comparison we append the per- 
centage of silver in sulphanilate of silver, which is 38‘57. 
3 R 2 
