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Show 98 ON COLOUR-HEREDITY IN FANCY MICE AND RATS. [May 26, because they were white, or all glabrous stocks because they glabrous. Professor Weldon's appeal for the precise gametic formula of F, must at present go unanswered. Pending analysis of the various coloured types in F2, no one could give the statistical composition of the gametes of Fx so far as coat-colour is concerned ; and though the general composition of F2 agrees closely with simple Mendelian expectation, the particular composition of the various types is a question that further experiment must decide. To take only one possibility, imperfect segregation is often seen in such cases of complex resolution. No criterion save the actual production of F3 from F2 can show whether any of the types of F, illustrate this phenomenon. When such evidence is forthcoming there is every likelihood that both the qualitative and quantitative composition of the gametes of Fx will be determinable with approximate accuracy.] Bibliographical Summary. (Scattered through zoological and fanciers' literature there many notes on this subject not here cited.) 1. BATESON, W. ' Mendel's Principles of Heredity.' Cambridge, 1902. 2. 'Nature,' 1903, lxvii. pp. 462, 585; lxviii. p. 33. 3. and E. R. SAUNDERS. Rep. Evol. Committee Roy. Soc, No. 1, 1902. 4. " Note on the Resolution of Compound Characters by Cross-breeding." Camb. Phil. Soc. Proc. 1902, xii. p. 50. 5. CASTLE, W . E. " Mendel's Law of Heredity." Proc. Amer. Ac. Sci. 1903, xxxviii. especially pp. 542-4. 6. and W . C. FARABEE. " Notes on Negro Albinism." Science, 1903, xvii. p. 75. 7. • and G. M. ALLEN. " The Heredity of Albinism." Proc Amer. Ac. Sci. 1903, xxxviii. p. 603. 8. CORNAZ. Ann. Soc. Med. Gand, 1855, xxxiii. p. 269. [A monograph on human albinism.] 9. CRAMPE. " Kreuzungen zwischen Wanderratten verschiedener Farbe." Landwirths. Jahrb. vi. 1877, p. 384; continued ibid. xii. 1883, p. 389 ; xiii. 1884, p. 692. 10. " Die Gesetze der Vererbung der Farbe." Ibid, xiv 1885, p. 539. 11. CUENOT, L. Comptes Rendus, 1902, vol. 134, p. 779. 12. " La Loi de Mendel et l'Heredite de la Pigmentation chez les Souris." Arch. Zool. exp. et gen. 1902, p. xxvii. 13. CUMBERLAND, C. 'The Guinea-pig.' London (Upcott Gill), n. d., pp. 20-1. 14. DARBISHIRE, A. D. "Note on the Results of Crossing Japanese Waltzing Mice with European Albino Races." Biometrika 1902, ii. p. 101. 15 Hid. 1903, ii. p. 165. |