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Updated: July 9, 2025
But his experiments have been carefully repeated by qualified persons, and they have completely proved his ignorance: his rhodium is iron, and his silicon an impure incombustible coal. My dear Sir,
Take the trap out of the bed, and with a feather smear it with melted beeswax, or rub it with a little Oil of Rhodium, Assafoetida, or Musk. These are not always necessary but are often used as a last resort, and will most always insure success.
Such a conversion, indeed, would presuppose that the element was composed of two or more ingredients, and was in fact not an element; and until the decomposition of these bodies is accomplished, and their constituents discovered, all pretensions to such conversions deserve no notice. Dr. Brown of Edinburgh thought he had converted iron into rhodium, and carbon or paracyanogen into silicon.
There is a sweet-scented wood in the east known by the name of lignum aloes, and possibly the sweet gum called belzoe may have been extracted from it, or from that which produces the oil of rhodium. This country has plenty of wood fit for the construction of ships.
This substance is always native it is always in the metallic state; and the metals with which it is found connected, and which are rarely found elsewhere, are palladium, rhodium, iridium, osmium, and ruthenium.
I think that oil of rhodium and oil of aniseed are very good to drop on the traps after setting, or to mix with the stuff with which the traps are covered. There is also another way of bolting Rats. Sometimes when the ferret is put under a boarded floor, all the Rats will run together and pack themselves in a heap at the end of a joist.
Take twenty drops of the oil of rhodium, six or seven grains of musk, and half an ounce of oil of aniseed; put them in a small phial, and shake it well before using; then dip a piece of twisted paper or rag in the mixture, and rub each end of the trap with it, if a box trap, and put two or three drops on the bridge, leaving the paper or rag in the trap.
First, to a quart of oatmeal, add six drops of oil of rhodium, one grain of musk, and two or three of the nuts of nux vomica finely powdered; make them into pellets, and put them into the rat-holes. This, it is said, was at first greedily eaten, and did great execution; but the wise animals, after a time, ceased to eat it.
Then there is this curious relation, that palladium and iridium are very much alike, so that you would scarcely know one from the other, though one has only half the weight of the other, and only half the equivalent power. So with iridium and rhodium, and osmium and ruthenium, which are so closely allied that they make pairs, being separated each from its own group.
Some entice them into a very large bag, the mouth of which is sufficiently capacious to cover nearly the whole floor of the place where they are collected; which is done by smearing some vessel, placed in the middle of the bag, with oil of rhodium, and laying in the bag baits of proper food.
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