A. 1). Dakiushiuk 



285 



TABLE III. 



Aitioinit (if W/iiteiie.fs *. 

 Graiidcliild. 



a 



es 



na 



c 



03 

 6 



5. A last important diflference, upon which T will imt at present comment, lies 

 in tliis. The cross between the ordinary albiiio and tlic pure waltzer has so far 

 invariably giveu dark-eyed young, but out of the eiglity young already produced 

 by Crossing extracted albinos with pure waltzers live havc pink eyes. 



Doubtless different pcople will Interpret tiieso phenomena in diftcrent vvays : 

 but the subjeet of the present paper is not a question of Interpretation but of l'act: 

 and I have confined myself to the mere statement of the fact until a larger 

 number of cases ju.stify an attempt at Interpretation. 



Postscript. Added June Uh. The foregoing account treats only of the 

 offspriug of extracted recessives. A mouse of the same generation as the latter, 

 a waltzer with pink eyes and a yellow and white coat {G'G' of Mr Bateson's 

 notation, — the form which Castle asserts to be the extracted dominant) has served 

 four pure-bred albino does ; three of which have families old enough for descrip- 

 tion. In the notation of my previous reports they may be described as follows : 



This mouse is clearly not a pure dominant, because it produce'S albinos; it, is 

 not a dominant hybrid because it has pink eyes; and it cannot be a recessive 

 because when paired with an albino it produces somc black-eyed forms. 



* Scale of whiteness is that of the Secontl Keport. I find /t= -12.07, ': = -0f;27, and tlie eciuation 

 for )• 



■04204i-' + •00243r'^ + -07207^^ + •002'J4)-' + -lOSSg)'-' + •OO.S94r= + )• - -40798 = 0. 



Tlie Solution of wbicb is 7-=-4.51. 



Thus in this case as in the previous one we see tbe ancestry of recessive individuals is of importancc, 

 for a very sensible correlation cxists between the ofi'spring and the graudpareut witb wbicb tbe offsiiring 

 are connected througb tbeir reccssi%'e parent. 



