until they wore mighty gum to urcss themselves,“The best quality of charcoal,” says the Engineer, **18 made from oak, maple, beech and chestnut. Wood will furnish, when properly charged, about 20 per lt;jent. of coal. A bushel of coal from pine weighs about 29 pounds, A bushel of coat frbm bard wood weighs 30 pounds. About 100 parts of oak make 23 of charcoal; • tho same quantity ofred pine 22.10, and of white pine 23.”' »r. In tho 11 rat number of Tub Journal,