Black(1728-1799) By the use of these instruments we have learned. that if we take 1000 or more different kinds of matter such as metals stones. salts. woods. cork. feathers. wool. water and a variety of other fluids although they be at first of different heats, let them be placed together in the same room without a fireBlack（1728—1799) “By the use of these instruments we have learned, that if we take 1000 or more different kinds of matter, such as metals, stones, salts, woods, cork, feathers, wool, water and a variety of other fluids, although they be at first of different heats, let them be placed together in the same room without a fire