No. 640] DATA CONCERN IX 



415 



The distribution of the new niul mnw ci'itical data is 

 excellent and oxeludes any intci-iiretatinn of liiikauc be- 

 tween the two uciics A and s. The cross-over classes, 

 consistiiiu' ol a-«uiti pidiald and iion-aj^onti sell', to^'ctlier 

 mimber 'IVl. Tiiis is 4:).ii7 • per cent, of the total 

 number of raised, \ iz.. and the deviation is 



less than one per cent, t'l-oni Ww ci-oss-on ci- \ahic ex- 

 pected in independent assort inciil. which rcsidt is well 

 within tlie probable ei-i'oi-, 1.<!1. 



Combining Dunn's (h-ita with the new (hila uivcs a 

 larger number of animals on which to l)ase conchisioiis. 

 Also, any slight (h'\ialion ti'(Mn the normal indei)endent 

 segregation due to random samplinu- will tend to disap- 

 pear when larger nund)ers aiv inxoKcd. On the other 

 hand, a small excess of the mm ci..-. ..v. , .-Li^^. \\ t con- 

 sistently appears in both set>. ol data. mn>t he con-idci'ed 

 significant, should it be more than liiiec timo the prob- 

 able error. The eomhine<l <lata an- m tne lower 

 lines oi* Tabh' 1. Ilcr." Ww cro^^ o\ .t cla^.. . coh^Im of 

 agouti ])icl.al<l an I non-auonli M-lf, and incln.h :)7 ^ indi- 

 ^idna^. Thi^ i- 47. Jo per cent, ol' the LLilo jinimaK 

 r.il^..l. .iml ha^ a pinl,ib!e error of ± 0.9(). Tlu .le\ i.,- 

 ti(»ii ol the cross-o\-ei' \ alne from the 50 ])er cent, wdue 



the range of thre^' tme- the piohnblc error (it L\S8). 

 The new data ami the eomlmicd data aun-e in showing 

 that the two genes are mdepemlent. 



The Reta-iio.n or P>T.ACK-EVKI>-^^HI i k Sim.i iin., m A.,.)i ii 

 In this s(>ction will be ])re<ented further data on the 

 relation of l)lack-e\ed-\\hite <potti-u ' - ' - to 



Little' ( liMJ and l'n7) d, nnu.Mi • 



