Count Rumford's experimental essays, political, economical, and philosophical. : of a remarkable law which has been found to obtain, in the condensation of water with cold, when it is near the temperature at which it freezes, and of the wonderful effects which are produced by the operation of that law, in the economy of nature : together with conjectures respecting the final cause of the saltness of the sea. Essay VII, Of the manner in which heat is propagated in fluids :