Quite possible, the experience, made at an early day with the breeding of animals, revealed the harmfulness of in-breeding. How far this experience went transpires from the manner in which, according to the first Book of Moses, chap. 30, verse 32 and sequel, Jacob understood how to outwit his father-in-law Laban, by knowing how to encompass the birth of eanlings that were streaked and pied, and which, according to Laban's promises, were to be Jacob's. The old Israelites had, accordingly, long before Darwin, studied Darwinism. Once upon the subject of the conditions existing among the old Jews, a few other facts are in order, clearly proving that, among them, descent in the female line was actually in force of old. True enough, on the subject of woman, I Moses, 3, 16, runs this wise: "And thy desire shall be to thy husband, and he shall rule over thee;" and the verse also undergoes the variation: "the woman shall leave father and mother, and cleave to her husband." In point of fact, however, I Moses, 2, 24, has it this way: "_Therefore shall a man leave his father and mother and shall cleave unto his wife_, and they shall be one flesh." The same language recurs in Matthew 19, 15; Mark 10, 7, and in the Epistle to the Ephesians 5, 31. The command sprang, accordingly, from the system of descent in the female line, and the exegetists, at a loss what to do with it, allowed it to appear in a light that is utterly false. Descent in female line appears clearly also in IV Moses, 32, 41. It is there said that Jair had a father, who was of the tribe of Judah, but his mother was of the tribe of Manasseh, and Jair is expressly called the son of Manasseh, and he inherited in that tribe. Another instance of descent in the female line among the Jews is met in Nehemiah 7, 63. There the children of a priest, who took to wife one of the daughters of Barzillai--a Jewish clan--are called children of Barzillai; they are, accordingly, not called after the father, who, moreover, as a priest occupied a privileged position, but after the mother. For the rest, already in the days of the Old Testament, accordingly, in historic times, the father-right prevailed among the Jews, and the clan and tribe organization rested on descent in the male line. Accordingly, the daughters were shut off as heirs, as may be seen in I Moses 31, 14-15, where even Leah and Rachel, the daughters of Laban, complain: "Is there yet any portion or inheritance for us in our father's house? Are we not counted of him strangers? for he has sold us, and hath quite devoured also our money."