In the genealogical material previously considered, we have a sampling of the American population throughout its whole history, but the data so far collected are insufficient for more than an indication of what might be expected in further research along the same line. In the following table as before, the figures compiled from printed genealogies are separated from those obtained through correspondence and from miscellaneous sources. The "unrelated" marriages from genealogies, are marriages of brothers and sisters of the persons who have married first cousins, and their records were obtained from the same sources as those in the next previous category. The "children of first cousins" are the offspring of the first cousin marriages who married persons not related to themselves by blood. The last category includes distantly related marriages from correspondence and other sources and marriages between persons of the same surname whose relationship could not be traced. TABLE XIII. ------------------------------------------------------------------ | | Sex of Children. | |Number |-----------------------|Mascu- Marriages. |Fertile.| Male.|Female.|Unknown.|linity. ------------------------------------------------------------------ 1st cousin. Gene. | 125 | 318 | 314 | 40 | 101 Unrelated. Gene. | 629 | 1561 | 1559 | 64 | 100 Ch. of 1st cousins. Gene.| 170 | 402 | 375 | 48 | 107 Other cousin. Gene. | 301 | 736 | 666 | 15 | 111 1st Cousin. Cor. | 150 | 316 | 295 | 148 | 107 Ch. of 1st cousins. Cor. | 124 | 192 | 164 | 214 | 111 Miscellaneous | 88 | 210 | 205 | 50 | 102 ------------------------------------------------------------------ Total | 1587 | 3735 | 3578 | 578 | 104.4 ------------------------------------------------------------------ It is of course impossible to explain all the ratios in this table. Much variation is here due to chance, and a few additional cases might appreciably change any of the ratios. It will be noticed, however, that the two categories whose masculinity is most similar (100 and 101), are derived from cases taken from the same families and from the same environment, and differing only in that the first is closely consanguineous while the second is not. The third and fourth groups, separated from the first two by at least a generation, and probably living in a different environment, differ greatly in masculinity from them. In the fourth group are included 1-1/2, second, third, and a few even more distant cousins, all more distantly related than first cousins, and taken from the same genealogies as these; yet the masculinity is much greater. An analysis of the cases collected fifty years ago by Dr. Bemiss, of course without thought of masculinity, gives the following result:[40]