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Updated: May 20, 2025
When dry, the object should be suspended under a glass shade and exposed to a stream of sulphuretted hydrogen gas; or it may be immersed in a solution of 1 part of phosphorus in 15 parts of bisulphide of carbon, 1 part of bees-wax, 1 part of spirits of turpentine, 1 part of asphaltum, and 1/8 part of caoutchouc dissolved in bisulphide of carbon.
In five minutes we had seen, handled, and smelt enough to satisfy us with this very odd and very nasty vagary of tropic nature; and as we did not wish to become faint and ill, between the sulphuretted hydrogen and the blaze of the sun reflected off the hot black pitch, we hurried on over the water-furrows, and through the sedge-beds to the farther shore to find ourselves in a single step out of an Inferno into a Paradiso.
It would be easy to suppose some connexion between the waters filtering through this calcareous stone, and decomposed by pyrites and the earthquakes of Cumana, the springs of sulphuretted hydrogen in New Barcelona, the beds of native sulphur at Carupano, and the emanations of sulphurous acid which are perceived at times in the savannahs.
To be applicable to the preservation of plants, of course it is necessary that the agents to be used should not exercise on them any materially injurious effects. This must be determined by experiments made expressly for the purpose. The few trials I have yet made on seeds seem to shew, that the steeping them in a solution in water of sulphuretted hydrogen has not prevented their germination.
"Well then, say `I'm a beastly cad, and a funk, and a sneak, and I knuckle under and will never do it any more." "I'm a beastly cad," gasped Parson, choking with shame, anger, and sulphuretted hydrogen, "and a funk, and a sneak, and I knuckle under and will never do it any more." "Now all the rest of you say it!" Telson, Bosher, and King obeyed, one after the other. "Is that all of you?"
The vapour of nitric acid was equally fatal with sulphuretted hydrogen; and, in alcoholic vapour, at a temperature of 74°, 'for a few minutes the fly shewed increased activity; in a few more, it became nearly motionless; after about a quarter of an hour, it appeared to be torpid.
As regards sulphur and its compounds, that ill-smelling gas, sulphuretted hydrogen, which occurs in rotten eggs, in organic effluvia from cesspools and the like, and which in the case of bad eggs, and to some extent with good eggs, turns the silver spoons black, and in the case of white lead paints turns these brown or black, I can show you some still more convincing proofs that sulphur is contained in wool, fur, and hair, and not in silk nor in vegetable fibres.
Polished steel put into a solution containing a copper salt receives a coating of metallic copper. Ammonia gives a whitish-blue precipitate, soluble in excess. Ferrocyanide of potassium gives a rich red-brown precipitate. Sulphuretted hydrogen gives a deep brown precipitate. The salts of zinc requiring notice are the sulphate and chloride.
This is considerably augmented in the rainy season; the rivulet is then transformed into a torrent, and its heat diminishes for it appears that the hot springs themselves are subject only to imperceptible variations. All these springs are slightly impregnated with sulphuretted hydrogen gas. The fetid smell, peculiar to this gas, can be perceived only by approaching very near the springs.
In these old rambling passages one smelt a stink as of all the rotten eggs in all the barn-yards of the world; and this sulphuretted hydrogen was the least dangerous of the gases against which a miner had to contend. There was the dreaded "choke-damp," which was odourless, and heavier than air.
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