The Origin of a Polydactylous Race of Guinea Pigs

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The young of these four males are classified as regards the extra-toe character in tables 4 to 7 (see pages 25 and 26). An examination of these tables shows for <$ 809 an increase of potency over that of his father, <$ 193; $ 711 shows a potency very similar to that of his father, but the other two males, 628 and $ 635, are clearly inferior to their father in potency, their average grades being about 34 and 38 respectively, while that of their father was 46. 5. PROGENY OF THE FOURTH POLYDACTYLOUS GENERATION. The sires of the next generation consisted of six males, four of which were sons of the best male (809) of the previous generation, while one was a son of, ^628, and one a son of c?7H. Considering first the four sons of <$ 809 (table 7), we notice that three of them, <$ 954 (table 8), $ 1140 (table 10) and $ 1264 (table 13), are clearly inferior to their father in potency. The fourth male, <$ 1263 (table 12), makes a somewhat better showing than his father, though two of the possible groups of mothers (F and N) are wholly unrepresented among his mates and their values can only be roughly estimated by interpolating values, while two other groups are very inadequately represented.

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