The compiler of the, as yet, unpublished Loomis genealogy writes me that he has the records of 7500 marriages in that family, of which 57 or .8 per cent are same-name marriages. This would indicate that 1.07 per cent were between first cousins. In isolated communities, on islands, among the mountains, families still remain in the same locality for generations, and people are born, marry and die with the same environment. Their circle of acquaintance is very limited, and cousin marriage is therefore more frequent. If we exclude such places, and consider only the more progressive American communities, it is entirely possible that the proportion of first cousin marriages would fall almost if not quite to .5 per cent. So that the estimate of Dr. Dean for Iowa may not be far out of the way. Even for England Mr. Darwin's figures are probably much too large. Applying the corrected formula his table becomes: TABLE VI. ---------------------------------------------------- |Number |Per cent of|Per cent of 1872. |marriages |same-name |first cousin |registered.|marriages. |marriages. ---------------------------------------------------- London, | | | Metropolitan | | | Districts | 33,155 | .55 | .73 Urban Districts| 22,346 | .71 | .95 Rural Districts| 13,391 | .79 | 1.05 ---------------------------------------------------- Total | 68,892 | .64 | .85[A] ---------------------------------------------------- [A] Cf. Mulhall, .75 per cent, _supra_, p. 18. In regard to the frequency of marriage between kin more distant than first cousins figures are still more difficult to obtain. The distribution of 514 cases of consanguineous marriage from genealogies was as follows: TABLE VII. --------------------------------------------------------------------- | First | 1-1/2 |Second | 2-1/2 | Third |Distant| |cousins|cousins|cousins|cousins|cousins|cousins|Total --------------------------------------------------------------------- Same-name | 70 | 24 | 49 | 19 | 20 | 26 | 208 Different-name| 96 | 30 | 58 | 22 | 37 | 62 | 305 --------------------------------------------------------------------- Total | 166 | 54 | 107 | 41 | 57 | 88 | 513 ---------------------------------------------------------------------