OF SULPHURIC ACID UPON VARIOUS CLASSES OF VEGETABLES. 
473 
Fucusamide. 
When fucusol is intimately mixed with eight or nine times its bulk of pretty con- 
centrated aqua ammonise, the oil and ammonia combine to form a slightly yellow 
crystalline mass. As fucusol is less soluble in liquor ammonise than furfurol, it requires 
a greater quantity of ammonia, and both liquids must be brought thoroughly into 
contact, otherwise the fucusol is apt to be acted on chiefly at the surface, while the 
interior of the mass contains a portion of nearly unaltered oil. The amide, which I 
shall call fucusamide, may be readily obtained in pretty long needles radiating from 
a centre by crystallizing it out of hot spirits of wine, in which it is very soluble. In 
appearance it closely resembles furfuramide, but is a much less stable compound. 
I. 0'413 grin, amide dried in vacuo, gave 1*02 carbonic acid and 0*174 water. 
II. 0*332 grin, amide dried in vacuo, gave 0*809 carbonic acid and 0*138 water. 
III. 0*357 grm. amide dried in vacuo, gave 0*884 carbonic acid and 0*152 water. 
0*402 grm. amide dried in vacuo by Will’s method, gave 0*655 double chloride of 
platinum and ammonia= 10*23 per cent, nitrogen. 
Calculated numbers. 
I. 
II. 
III. 
15 C 1125 
67-17 
67*35 
66*46 
67*53 
6 H 75 
4*47 
4*67 
4*61 
4*72 
3 O 300 
17-91 
17*75 
18*70 
17-52 
1 N 175 
10*45 
10*23 
10*23 
10*23 
1675 
100*00 
100*00 
100*00 
100*00 
The formula of fucusamide is therefore 
Ci5 H, 
O 3 Nj, being identical with that of 
furfuramide. 
Thiofucusol. 
M. Cahours observed, that when furfuramide is dissolved in spirits of wine, and a 
current of sulphuretted hydrogen sent through the solution, a whitish granular pre- 
cipitate falls, which consists of a compound in which the half of the oxygen in furfur- 
amide is replaced by sulphur. On passing a current of sulphuretted hydrogen through 
a cold alcoholic solution of fucusamide, a corresponding compound was formed, which 
closely resembles thiofurfurol in appearance and properties. 
0*477 grm. thiofucusol dried in vacuo, gave 0*929 carbonic acid and 0*170 water. 
0*6045 grm. thiofucusol dried invacuo, gave 1*26 sulphate of baryta=28*65 sulphur. 
Calculated numbers. 
Found numbers. 
10 C 
705 
53*58 
53*12 
4 H 
50 
3*58 
3*95 
2 8 
400 
28*58 
28*65 
2 0 
200 
14*26 
14*28 
1355 
100*00 
100*00 
MDCCCL. 3 p 
