168 !Second Report oii Croas-bred MIce 



Froni tlie i'ulluwin«^ re-classiKcatioii of the a,bovc Tablo I. thc t'ro(iuency of 

 degrees of whitcuuss aniong 15-i hybrids will bc at onco cvidcul. 



Group 1 3 



Group 2 30 



Group 3 35 



Group 4 16 



Group 5 (J9 



Grunp 6 1 



154 



That i.s to say thc majority of hybritls havu coiüurcd patchcs in, roughly, the 

 saiiic place as thc waltzcrs liavc ; or are wild-colourcd rnicc cxcept for thc belly. 



Thc foUowing arrangeincnt shcws thc frcquency of colours among 154 hybrids. 



Class a 7 



Class b 



Ckiss c 112 



Clana d 2(3 



Class e 9 



154 



That is to say by far tlio grcatcr uumbcr of hybrids cxhibit wild rolnur. 



Offspriiif/ of Hi/brids. 



Hybrid.s liavc bccii paiicd inter sc and crosscd with albiuos. 



A. Off spring of pairs of Ili/brids. 



Tiio numbcr of mice which waltz in this gcneration is eight. At picsent nine 

 albinos have appearcd : thc actual arrangemcnt of thc colours and the colovirs 

 themselves arc hcrc shewn : thc Icttcr w indicatcs that thc niousc cxhibits waltzing 

 niovciiients, and p that it has pink cycs. It is uniicccssary to say that albinos 

 havc pink cyes. 



//,. ? 2rf X / 2c. 



3 Young. %f(wp), 2a (p), 2b. 



11,. ? Ic X ^ 2c. 



4 Young. 36 {p), 3c, 4a {p), 4« {p). 



H.,. ? 2rf X J- 3c. 



5 Young. Sa, 36, 36, 3e(w), Sf. 



II„. ? 2c X c/- 2c. 



7 Young. 4 albinos, 'db(wp), '6b (p), 3c. 



