Principles of Breeding a Treatise On Thremmatology Or the Principles And Practi
Principles of Breeding a Treatise On Thremmatology Or the Principles And Practi
E Eugene Davenport
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2 Ibid. P. 50. 3 Loeb, Physiology of the Brain, p. 82. 336 CAUSES OF VARIATION Born succeeded in uniting tadpoles of two different species of frogs, Rana esculenta for the anterior part and R. Arvalis for the posterior. This "made-up" animal lived seventeen days. Harrison succeeded in keeping an individual made up of R. Virescens and R. Palnstris until its transformation from a tadpole into a frog. 1 In the same way earthworms may be built up of two or more individuals of the same or of differe...nt species, and the pieces used in this building up may even be reversed, so that the middle part of the made-up worm may have its posterior part placed anteri- orly, or the reverse. Worms may be made with two heads, with or without a tail, or with two tails, with or without a head, - though the latter, for obvious reasons, can live but a short time. 2 Ribbert grafted a portion of mammary gland into the ear of the guinea pig, where it grew, and when the pig became pregnant the grafted tissue secreted milk?
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