[38] Sedgwick, ‘Brit. and For. Med.-Chirurg. Review,’ April, 1861, p. 485. In some accounts the number of children and grandchildren is given as 37; but this seems to be an error judging from the paper first published in the ‘Baltimore Med. and Phys. Reg.’ 1809, of which Mr. Sedgwick has been so kind as to send me a copy.
[39] Prosper Lucas, ‘Héréd. Nat.,’ tom. i. p. 400.
[40] Sedgwick, ibid., July, 1861, p. 202.
[41] Piorry, p. 109; Prosper Lucas, tom. ii. p. 759.
[42] Prosper Lucas, tom. ii. p. 748.
[43] Prosper Lucas, tom. iii. pp. 678, 700, 702; Sedgwick, ibid., April, 1863, p. 449, and July, 1863, p. 162. Dr. J. Steinan ‘Essay on Hereditary Disease,’ 1843, pp. 27, 34.
[44] These cases are given by Mr. Sedgwick on the authority of Dr. H. Stewart, in ‘Med.-Chirurg. Review,’ April, 1863, pp. 449, 477.
[45] ‘Héréd. Nat.,’ tom. ii. p. 852.
CHAPTER XV.
ON CROSSING.
FREE INTERCROSSING OBLITERATES THE DIFFERENCES BETWEEN ALLIED BREEDS—WHEN THE NUMBERS OF TWO COMMINGLING BREEDS ARE UNEQUAL, ONE ABSORBS THE OTHER—THE RATE OF ABSORPTION DETERMINED BY PREPOTENCY OF TRANSMISSION, BY THE CONDITIONS OF LIFE, AND BY NATURAL SELECTION—ALL ORGANIC BEINGS OCCASIONALLY INTERCROSS; APPARENT EXCEPTIONS—ON CERTAIN CHARACTERS INCAPABLE OF FUSION; CHIEFLY OR EXCLUSIVELY THOSE WHICH HAVE SUDDENLY APPEARED IN THE INDIVIDUAL—ON THE MODIFICATION OF OLD RACES, AND THE FORMATION OF NEW RACES BY CROSSING—SOME CROSSED RACES HAVE BRED TRUE FROM THEIR FIRST PRODUCTION—ON THE CROSSING OF DISTINCT SPECIES IN RELATION TO THE FORMATION OF DOMESTIC RACES.