arsenical

The Arsenical vapours being conducted into this passage, adhere both to the sides thereof and to the joists that lye across it.

Arsenical compounds have supplanted practically all other substances used to combat external biting insects.

Iron and Arsenical Pyrites are also very common attendants, and are both confounded under the name of Mundic.

A fresh section of it shows it to be Arsenical Iron Pyrites, each piece weighing four or five ounces.