| ℞. | Arsenic, | 1 ℔. |
| Calcined alum, | 1 1/2 ℔. | |
| Purified sea salt, | 1/2 ℔. |
The whole to be reduced to a fine powder and well mixed.
We advise that powdered arsenic never be used, because, by volatilizing, it might penetrate the lungs and cause mortal ravages.[N]
The preparor Nicholas recommends, in certain cases, a composition which ought to be here mentioned, not to advise the use of it, on the contrary, to advise the rejection of it; for far from driving off the insects, it attracts them; he calls it gummy paste.
| ℞. | Colocynth, | 2 ℥. |
| Gum Arabic, | 4 ℥. | |
| Amidon, | 6 ℥. | |
| Cotton, hashed fine, | 1 ℥. |
Other preparors, without passing any thing over the skin, confine themselves to the use of the following powder:
| ℞. | Calcined alum, | 3 ℥. |
| Flour of sulphur, | 1 ℥. | |
| Black pepper, | 1/2 ℥. | |
| Powdered tobacco, | 1/2 ℥. | |
| Powdered sabine, | 1/2 ℥. | |
| Powdered camphor, | 3 ʒ. |
The whole to be finely powdered and well mixed.