390 Mr.'C. C. Hurst. [Feb. 1, 



Table II (DR x ER). 



Impure Dominant Bay and Brown Sires, containing Chestnut, Mated with 

 Recessive Chestnut Mares. 



Sires. 



Bay and brown 



Chestnut 





foals. 



foals. 



Total. 





44 



44 



88 





47 



33 



80 



St. .Angelo 



37 



41 



78 



Isinglass 



28 



34 



62 





32 



30 



62 



Ayrshire 



31 



29 



60 



Florizel II 



34 



25 



59 





26 



26 



52 





25 



24 



49 



Melton 



20 



23 



43 





18 



23 



41 





13 



15 



28 



Totals 



355 



347 



702 | 



Of the above heterozygous bay and brown sires containing chestnut, Royal 

 Hampton, St. Angelo, Isinglass, Orvieto, Isonomy, Melton, and Wisdom had each 

 a chestnut parent ; Donovan, Pioneer, and Hose Window had both parents bay 

 or brown, with a chestnut grandparent ; Ayrshire had all the parents and 

 grandparents bay or brown, with a chestnut great-grandparent : while 

 Florizel II had all the parents, grandparents and great-grandparents bay or 

 brown, with a chestnut great-great-grandparent. It will be noted that, not- 

 withstanding these differences in ancestry, all are heterozygous, giving off 

 chestnut gametes in about equal numbers, in accordance with the Mendelian 

 expectation. 



Further records show that the recessive chestnuts, variously extracted from 

 bays and browns, as a rule breed true when mated together without reversion 

 to their bay and brown ancestors, in accordance with the Mendelian conception 

 of gametic purity. 



For example, 100 chestnut sires, variously extracted, mated with about 

 600 chestnut mares of various extractions, gave 1104 foals, of which 1095 are 

 recorded as chestnuts and 9 as bays or browns. That is to say, more than 

 99 per cent, of foals bred from chestnut parents are recorded as chestnuts, 

 while less than 1 per cent, are recorded as exceptions to the rule. The 

 apparent exceptions to the rule of chestnuts breeding true might have some 

 significance if they were more numerous, but they are too inconsiderable to 

 be of any certain value, and may simply represent breeders' or printers' 

 errors. 



