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all the registers he had seen, and that the same fact was observed in those of Breslaw, by Dr. Halley; who, not sufficiently attending to the cause, supposed it to be a mistake'.

(3) The following are two of the tables given by Mr. Barton, in his paper published in the American Philosophical Transactions, vol. iii., p. 36, &c.

TABLE VIII.

FROM DR. BARTON, EXHIBITING the DIFFERENCES IN THE DECREASE OF LIFE GENERALLY, ACCORDING TO BUFFON; AND ALSO IN THE TOWN OF NORTHAMPTON, AND COUNTRY PARISH OF HOLY CROSS, IN ENGLAND; AND THE TOWN OF SALEM IN MASSACHUSETTS, NORTH AMERICA, CALCULATED ON 1000 INHABITANTS.

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(4) The above table is quite conclusive. Others, however, will be added, so as to bring down the comparison to the present time; and, of course, since the general improvement in health, and especially since the introduction of vaccination has taken place. Dr. Seybert gives the bills of mortality for the year 1814, for Baltimore, Boston, New York, and Philadelphia, thus:

TABLE IX.

EXHIBITING THE BILLS OF MORTALITY OF THE CITIES OF BALTIMORE, BOSTON, NEW YORK, AND PHILADELPHIA, FOR THE YEAR 1814; THE TOTALS OF WHICH ARE PROPORTIONED TO 1000.

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(5) The National Calendar for 1822 gives for five of the cities of the United States, the following:

TABLE X.

SHEWING THE BILLS OF MORTALITY OF THE CITIES OF BOSTON, New YORK, PHILADELPHIA, BALTIMORE, AND CHARLESTON, FOR 1821.

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(6) I shall add another Table, and regarding the same cities, but bringing down the information to a later period, and given on the authority of resident physicians, Drs. Miles and Russ.

TABLE XI.

SHEWING THE MORTALITY IN THE CITIES OF NEW YORK, PHILADELPHIA, BALTIMORE, AND BOSTON, DURING A period of Seven Years, ENDING JANUARY 1, 1827, WITH THE TOTALS PROPORTIONED TO 1000.

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(7) I shall now proceed to exhibit the great difference which exists in the rate of mortality, comparing the bills of the capital of this empire with the foregoing towns of the United States, at about similar periods; by which it will be seen how greatly the latter must be affected by emigration. The comparison, however, will present the proof in question, less forcibly than almost any others that might have been instituted, in as much as the immense magnitude and populousness of London undoubtedly increases its mortality and moreover, there is a considerable effect produced upon its comparative intensity at the period in question, (the prime of life,) by the numbers of settlers who are constantly resorting thither, as well as to the American cities, though in a far less degree. These circumstances will diminish the difference which would otherwise have been still more striking; it remains, however, sufficiently great, fully to substantiate the present argument. I shall add a column in which the bills of mortality in the city of Carlisle, from 1774 to 1787, are similarly calculated, noticing also, that, even in the latter instance, the proof is deprived of much of its force, because the period referred to preceded the discovery of vaccination, and the late great improvement in general health and longevity.

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