On the other hand, we know that in the first Christian services held in the catacombs under the city of Rome, incense was burnt as a sanitary fumigation at least.
It is of a pale brown colour, transparent, brittle, and in consequence of its agreeable odour is used for fumigation and in perfumery.
After some unfortunate experiences arrangements were made in 1917 for the fumigation of the tobacco before shipment, with the result that the crop thereafter, in normal circumstances, commanded a high price in the markets of Great Britain.
The process of fumigation lasts from seven to nine months, and during it the tobacco acquires its black colour and peculiar flavour.
Powdered, it has little effect upon the skin, but in ointment or used by fumigation it has local therapeutic properties.