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 nothing can prevent the warm air of the room from escaping through it; and whenever this happens, there is not only an unnecessary loss of heat, but the warm air which leaves the room to go up the chimney being replaced by cold air from without, drafts of cold air cannot fail to be produced in the room, to the great annoyance of those who inhabit it.'

Such is a general description of Count Rumford's alterations in fireplaces. The subject, however, was pursued by him to its minutest details, and illustrated by numerous and specific plans for curing smoky chimneys under all possible circumstances. He likewise invented various forms of stoves and grates, intended to exhibit the model perfection of an apparatus for heating rooms, or for cooking victuals. So thorough and complete was his investigation of the subject, that little remained afterwards to be added to his conclusions; and it may be said, that any case of the continuance of a smoky chimney after the publication of his essays, arose from a neglect or misapplication of the principles there developed.

After some stay in Great Britain, he returned to Munich in 1796, accompanied by his daughter, who had come over from America at his request, her mother having died in 1792. What were Count Rumford's relations with America, during the long interval of his absence from it, we have no means of ascertaining; as far as can be inferred, however, he seems to have maintained little correspondence with his former friends in the United States till after his wife's death; and one cannot help remarking the unpleasing circumstance, that while on one side of the Atlantic the husband was enjoying an honorable position, and filling a large space in the public eye, the wife and daughter continued during the life of the former to reside on the other.

Rumford, on his return to Munich, was occupied in very important affairs. The advance of the French republican army under Moreau obliged the elector to quit the capital, leaving a council of regency, with Rumford at its head. Rumford succeeded in the arduous task of freeing Bavaria from invasion, and his conduct on this occasion increased his reputation with the elector and with the people. Among other tokens of the elector's gratitude for his services, he was permitted to settle one-half of the pension which he enjoyed on his daughter, to be paid during her lifetime. In 1798 the elector, partly with a view to gratify him with an honor which he knew he desired, and partly to afford him another opportunity of relaxation for the improvement of his health, appointed him ambassador at the court of Great Britain. On arriving in London, however, Rumford found, that in consequence of the English legal fiction, by which a born subject of the country is declared incapable of ever alienating his allegiance, he could not be received as the Bavarian ambassador. Mortified as he must have been by this circumstance, and still more deeply grieved by the loss of his friend and patron, the Elector Charles Theodore, who died in 1799, Rumford contemplated returning to spend the remainder of his life in the land of his birth. In compliance with a formal invitation which he received from the United States government, he was making preparations for his return, and had written to a friend to secure a cottage in the vicinity of Boston, as a 'quiet little retreat,' when he was led to change his design, and remain in London, in the society of which he occupied a conspicuous place. During several years, a great part of the Count Rumford's time was devoted to the interests of the Royal Institution, of which he may be