200 Proceedings of the Royal Society 
however, the hot alcoholic solution was mixed with just sufficient 
hot water to render it opalescent, crystals were readily formed on 
cooling ; the greater proportion of these were scales or plates, 
mixed with some needles of unaltered thioformanilid. A second 
crystallisation gave a crop of pure crystals which were washed with 
60% alcohol and dried in vacuo. Their melting-point is slightly 
higher than that of thioformanilid, 140° C., and, as is also the case 
with that body, the point of solidification is very much lower. 
They are nearly insoluble in hot benzol, and are practically unattacked 
by hot caustic soda, which first dissolves and then decomposes 
thioformanilid with formation of aniline, sodium formiate and 
sulphydrate. An analysis of this body, dried at 90° C., gave 
results agreeing very closely with the numbers calculated for the 
body formed from two molecules of thioformanilid by the abstrac- 
tion of one molecule of sulphuretted hydrogen. This would have 
the empiric formula, C 14 H 12 SN 2 . 
Found mean. 
c 14 h 12 sn 2 . 
Carbon, 
69*7 
70*0 
Hydrogen, . 
5*3 
5*0 
Nitrogen, . 
11*6 
11*7 
Sulphur (by dif.), 
13*4 
13*3 
100*0 
100*0 
The platinum salt, which, however, was non-crystalline, contained 
29*9 % platinum, C 14 H 12 SN 2 (HCl) 2 PtCl 4 contains 29*8% platinum. 
The above analyses settle the composition of this body, and the 
equation for the decomposition is simple enough. 
/C 6 H 5 
CSH 
H 
c 6 h 5 
N I = H 9 S + 
Its constitution, however, is uncertain, owing to the uncertainty 
with regard to the constitution of thioformanilid. This latter body 
may be written in either of two ways, according as it is supposed to 
contain the mercaptan group (CSH) 111 or the sulphaldehyde group 
(CHS) 1 . 
