8. _Sulphur and Silver._--The action is slow; eight compressions are
necessary.
9. _Sulphur and Copper._--Three compressions complete the combination.
When the product of the compression is heated, there is no development
of heat or light.
10. _Sulphur and Tin._--Three compressions give a block which yields
a yellowish-gray powder, easily soluble in a hot solution of sodium
sulphide. Stannic sulphide is therefore formed by the compression of
sulphur and tin.
11. _Sulphur and Antimony._--After two compressions we obtain a
gray-black mass having the color and luster of stibine. When powdered
it dissolves with ease in hot hydrochloric acid, giving off hydrogen
sulphide.
12. _Sulphur and Red Phosphorus; Sulphur and Carbon._--Result entirely
_nil_; there is produced not the least trace of phosphorus sulphide nor
of carbon sulphide.