A. I). l)Aia;isiiiiu<; 



283 



Three faiiiilics h;iv(> bccii iinnhicrd tVom siicli a cross. The ])aronts of tlio 

 albiiKis used liad always wild-colovir in thu coat, and the ottspriug of tliesc unions 

 had iuvariably the same colour. The results are given in Table I., bel<i\v. 



TABLE I*. 



2. Pure-bred waltzing mice have also been crossed with albioos produccd by 

 crossiug a hybrid with an albino. Thus : 



Waltzer Alliino 



First Gross Albino 



\V(dtzer x Albino 



And the nieasure of the correlation whicli exists with regard to colour betweeu 

 offspriug thus produced and the hybrid graudparent is shown in Table II. 



TABLE II. 

 Colour of Grandchild. 



Working out this table by the method for dealing with quantitatively indeter- 

 niinate characters, we find, using the notation of Phil. Trans. A., Vol. 195, p. 6, 



h = 1-21344, k =1-03643, 

 with an equatiou of many terms having the Solution 



r = -951. 



This correlation between grandparent and grandchild with regard to a "domi- 

 nant charactcr" trausuiitted througli the reccssive pareut seenis to dispose entirely 

 üf any theory which involves the gametic purity uf the recessive pareut. 



* The notation being tlie sauie as in the last lleport. Biometrika, Vol. ii. p. Ki.") 



36—2 



