In the new book of travels by Mr. Fortune, whose services we are happy to know have been engaged by the Patent Office at Washington, there is a receipt for the composition of the mosquito powder mentioned by other visitors of China as eminently successful in dispersing these nuisances. What " nu-wang" is, we are not informed. "The persons employed, at the end of two months, ascertained that the ingredients were pine and juniper savings, wormwood leaves, and tobacco leaves reduced to powder, a §mall portion of nu-wang, and arsenic The quantity of the latter is exceedingly small, and can hardly be injurious to health. The odor is not at all disagreeable, " not more so than the incense which is burned in every Chinaman's house who can afford the luxury. It is no luxury to the mosquito, however, for, in two or three minutes after it is ignited, not a buzz is heard, or mosquito seen. Mr. Fortune ascertained the proportion of the ingredients, and the different forms in which it is for sale.

One of these is in little coils, one hundred of which may be bought for a sum equivalent to three pence of our money, and two of them will suffice for a night, in an ordinary-sized room".