The difference between bodies in respect to specific heat may be roughly illustrated as follows: small balls of equal weight, made severally of iron, copper, tin, lead and bismuth are heated to a temperature of 180 deg. or 200 deg. C. by immersing them in hot oil until they all acquire the temperature of the oil. They are then placed on a cake of beeswax about half an inch thick. The iron and copper will melt their way through the wax, the tin will nearly do so, while the lead and bismuth sink not more than half way through the wax.