The potatoes being mashed, (without peeling them,) and the greens chopped fine with a sharp shovel, they were mixed together, and 98 lbs of butter, 14 lbs. of onions boiled and chopped fine, 40 lbs. of salt, 1 lb. of black pepper in powder, and 1/2 lb. of ginger, being added, and the whole well mixed together, this food was served out in portions of 1 quart, or about 2 lbs. each, in wooden noggins, holding each 1 quart when full. Each of these portions of Calecannon (as this food is called in Ireland) served one person for dinner and supper; and each portion cost about 2 1/14 pence, Irish money, or it cost something less than ONE PENNY sterling per pound. Twelve pence sterling, make thirteen pence Irish. The expence (reckoned in Irish money) of preparing this food, was as follows: viz. L. s. d. Potatoes, 19 cwt. at 3s. 6d. per cwt. -- -- 3 6 6 (N.B. They weighed no more than 1615 lbs. when picked and washed.) Greens, 26 flaskets, at 10d. each, -- -- -- 1 1 10 Butter, 98 lbs. at 72s. per cwt. -- -- -- 3 3 0 Onions, 14 lbs. at 2s. per stone, -- -- -- 0 2 0 Ginger, 1/2 lbs. -- -- -- -- -- -- -- 0 1 3 Salt, 40 lbs. -- -- -- -- -- -- -- -- 0 1 1 Pepper, 1 lb. -- -- -- -- -- -- -- -- 0 1 1 --------- L. 7 16 9 Expence for fuel, 17 pecks of coal, at 1L. 3s. 3d. per ton, -- -- -- -- -- 0 3 2 1/2 ------------- Total L. 7 19 11 1/2 With this kind of food there is no allowance of bread, nor is any necessary. It would be hardly possible to invent a more nourishing or more palatable kind of food, than Calecannon, as it is made in Ireland; but the expence of it might be considerably diminished, by using less butter in preparing it. Salted herrings (which do not in general cost much more than a penny the pound) might be used with great advantage to give it a relish, particularly when a small proportion of butter is used. In this experiment, 273 gallons of water, weighing about 2224 lbs. avoirdupois, and being at the temperature of 55 degrees, was made to boil, (in two hours and 32 minutes,) with the combustion of 346 1/2 lbs. of coal; which gives rather less than 6 1/2 lbs. of water, to each pound of coal consumed; the water being heated 157 degrees, or from 55 to 212 degrees. According to my experiments, 20 lbs. of water may be heated 180 degrees, (namely from 32 degrees the freezing point, to 212 degrees the temperature of boiling water,) with the heat generated in the combustion of 1 lb. of pine-wood; consequently, the same quantity of wood (1 lb.) would heat 23 lb. of water 157 degrees, or from 55 to 212 degrees.