98 ox COLOUR-HEEEDITY IX FANCY MICE AXD RATS. [May 26, 



because they were white, or all glabrous stocks because they were 

 glabrous. 



Professor Weldon's aj)peal for the precise gametic formula of F^ 

 must at present go unanswered. Pending analysis of the various 

 coloured types in F^? ^^ one could give the statistical composition 

 of the gametes of F^ so far as coat-colour is concerned ; and though 

 the general composition of F^ 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 Fg 

 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 c[uantitative com^^osition 

 of the gametes of Fj will be determinable with approximate 

 accuracy.] 



Bibliographical Suminary. 



(Scattered through zoological and fanciers' literature there are 

 many notes on this subject not he3"e cited.) 



1. Bateson, W. ' Mendel's Principles of Heredity.' Cambridge, 



1902. 



2. 'Nature,' 1903, Ixvii. pp. 462, 585; Ixviii. 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 Yererbung der Farbe." Ibid. xiv. 



1885, p. 539. 



11. CuEXOT, L. Comptes Rendus, 1902, vol. 134, p. 779. 



12. " La Loi de Mendel et I'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 Ibid. 1903, ii. p. 165. 



