2I 4 



A. H. STUKTEVANT. 



The last character I have to deal with is roan. This, like gray, 

 is epistatic to the four usual colors in most families, but may 

 not be in all. 



Many of the roans of to-day go back to the old roan race-mare 

 Lady Franklin, through her daughter Lady Frank and grandson 

 Jay Bird, both roans. Jay Bird sired Eagle Bird, Jay Hawker, 

 Allerton and Jackdaw, and Jay Hawker sired Jay McGregor. 

 The following table shows all foals but chestnuts. 



Allerton's roan foal is from a roan daughter of Jay Bird. 



Another family goes back to Laura Fair, roan, through her 

 roan granddaughter Spanish Maiden. This last mare produced 

 I bay and 3 roans, including the sire Margrave. Tom Hal, Jr., 

 founded another family of roans, and another goes to the roan 

 mare Tilla, which had 4 bay foals, I brown and 3 roans, the latter 

 including Fred S. Wilkes. The Brown Hal appearing in the 

 table below is a son of Tom Hal, Jr. Chestnut foals are omitted 

 as before. 



Foals. 



where gray remained dominant for three generations only to disappear before the 

 chestnut of the mare Blue Stocking in the Viscount and Blue Stocking filly Miss 

 Johanna!" Just what that passage was intended to mean is a problem which I 

 have not yet solved. What do blacks produce when mated together, and what 

 has that to do with skipping a generation or so? And if a recessive cannot skip 

 what can? Certainly not a dominant. What is to prevent us from supposing 

 Viscount a heterozygote? 



