3. The housing were A.D. 1671 but 3,850, which if they had increased A.D. 1682 but according to the burials, they had been but 5,143, or, according to the hearths, had been but 5,488, whereas they appear 6,025, increasing double to the hearths. So as it is likely there hath been some error in the said account of the housing, unless the new housing be very small, and have but one chimney apiece, and that one-fourth part of them are untenanted. On the other hand, it is more likely that when 1,696 died per annum there were near 6,000; for 6,000 houses at 8 inhabitants per house, would make the number of the people to be 48,000, and the number of 1,696 that died according to the rule of one out of 30, would have made the number of inhabitants about 50,000: for which reason I continue to believe there was some error in the account of 3,850 houses as aforesaid, and the rather because there is no ground from experience to think that in eleven years the houses in Dublin have increased from 3,850 to 6,025. Moreover, I rather think that the number of 6,025 is yet short, because that number at 8 heads per house makes the inhabitants to be but 48,200; whereas the 2,263 who died in the year 1682, according to the aforementioned rule of one dying out of 30 makes the number of people to be 67,890, the medium betwixt which number and 48,200 is 58,045, which is the best estimate I can make of that matter, which I hope authority will ere long rectify, by direct and exact inquiries. 4. As to the births, we say that A.D. 1640, 1641, and 1642, at London, just before the troubles in religion began, the births were five-sixths of the burials, by reason I suppose of the greaterness of families in London above the country, and the fewer breeders, and not for want of registering. Wherefore, deducting one-sixth of 2,263, which is 377, there remains 1,886 for the probable number of births in Dublin for the year 1682; whereas but 912 are represented to have been christened in that year, though 1,023 were christened A.D. 1671, when there died but 1,696, which decreasing of the christening, and increasing of the burials, shows the increase of non-registering in the legal books, which must be the increase of Roman Catholics at Dublin. The scope of this whole paper therefore is, that the people of Dublin are rather 58,000 than 32,000, and that the dissenters, who do not register their baptisms, have increased from 391 to 974: but of dissenters, none have increased but the Roman Catholics, whose numbers have increased from about two to five in the said years. The exacter knowledge whereof may also be better had from direct inquiries. OBSERVATIONS UPON THE DUBLIN BILLS OF MORTALITY, 1681: AND THE STATE OF THAT CITY. THE observations upon the London bills of mortality have been a new light to the world, and the like observation upon those of Dublin may serve as snuffers to make the same candle burn clearer.