ized bodies; and the quantity restored to it again by the burning or other separating of the parts of those bodies. Is not the natural heat of animals thus produced by separating in digestion the parts of food, and set ting their fire at liberty? Is it not this sphere of fire which kindles the war dering globes that sometimes pass through it in our course round the sun, have their surface kindled by it, and burst when their included air is greatly rar fied by the heat on the burning surfaces? |