PAGE 



vi Cmitents 



No. 4 (September, 1919) 



H. Onslow. The Inheritance of Wing Colour in Lepidoptera. 

 I. Abraxas grossulariata var. lutea (Cockerell). (With Plates IX 

 and X, table, and twenty-five text-figures) . . . . . 209 



J. W. Heslop Harrison. Studies in the Hybrid Bistoninae. III. The 



Stimulus of Heterozygosis. (With two text-figures) . . . 259 



Edward Hindle. Sex Inheritance in Pediculus humanus var cor- 

 poris. (With one chart) . . . . . . . .267 



C. C. Little. Colour Inheritance in Cats, with Special Reference to 



the Colours Black, Yellow and Tortoise-Shell . . . .279 



J. B. S. H ALDAN E. The Probable Errors of Calculated Linkage 

 Values, and the most Accurate Method of determining Gametic 

 from certain Zygotic Series . . . . . '. .291 



J. B. S. Haldane. The Combination of Linkage Values, and the 

 Calculation of Distances between the Loci of Linked Factors. 

 (With one text-figure) 299 



COKRIGENDA IN VOL. VII. 



P. 201, line 13, for K^J^0 ^o + iLj^^) («o-4rofo) 

 D 5 



read /f, = (i±/-«» ,„ + '! :_^'l) (,„._4r„(„). 

 P. 201, last line, for homozygotes read heterozygotes. 



CORRIGENDA IN VOL. VIII. 



P. 74, line 27, for equally 3 : 1 read equally 1 : 1. 



P. 79, last line but one, for (17 - 1) read (17 - 13). 



PI. II, fig. 5. The stem shews some brown pigment in the original drawing which has 

 been lost in the reproduction. 



