brought to the subject much zeal and industry, and the result of his researches is a work replete with valuable information upon the duration of human life in every quarter of the globe, and even in all the cities of any considerable size. Nor must it be forgotten that the profession owes much obligation to Dr. Clarke, who, in his work upon Climate, has faithfully and closely investigated the general physical characters of the milder parts of England, and his researches have proved eminently useful in directing the attention, and guiding the judgment, of medical men, in the application of these situations to the prevention and cure of disease.
Mr. Thackrah has also ably exhibited the effects of the principal arts, trades, and professions, and of the civic states, and habits of living, on health and longevity: with a particular reference to the trades and manufactures of Leeds: and has suggested means for the removal of many of the agents which produce disease, and shorten the duration of life. To which may be added a very ingenious article in the Cyclopædia of Practical Medicine, on the diseases of artizans, by my friend. Dr. Darwall. All these contributions, interesting as they are, can only be considered as incipient labours in this branch of knowledge.
To any one who is inclined to engage in the duty of collecting materials for increasing our knowledge of Medical Topography, I would wish strongly to recommend a careful perusal of the paper in the 67th number of the Edinburgh Medical and Surgical Journal, to which I have before alluded. The author of that paper divides the
