1906.] Offspring of Thorouglibred Chestnut Mares. 395 



these limitations, I believe the following statements are substantially 

 complete and accurate. 



The Chestnut mares recorded produced, in the period dealt with, 5643 foals 

 by 726 sires, the colours of the sires being as follows : — 



Colour of sire. 



No. of sires. 



Colour of sire. 



No. of sires. 



Ch. 



214 



Br. or Bl. 



10 



Ch. or Ro. 



2 



Bl. 



8 



Ch. or Bl. 



1 



Gr. 



3 



B. or Ch. 



1 



Ro. or Gr. 



1 



B. 



340 



Br. or Gr. 



1 



B. or Br. 



24 



Gr. or Bl. 



1 



Br. 



120 













726 



It will be seen that 41 of these sires are intermediate between some two 

 of the accepted colour-categories. 



Omitting the Eoan or Grey sires, the foals produced are shown in the 

 following table : — 



Offspring of Chestnut Mares. 



Colour of sire. 



Colour and frequency of foals. 



Ch. 



Int. 

 Ch. 



B. 



B. or 

 Br. 



Br. 



Br. or 

 Bl. 





Totals. 



Ch 1568 



B 1118 



B. or Br 44 



Br 233 



Br. or Bl 22 



Bl 13 



' 1 



~7 

 1 



2 



18 

 1449 



85 

 439 

 5 

 28 



2 

 89 



9 

 44 



1 



5 



3 



132 

 21 



146 

 5 

 11 



1 



4 

 2 

 13 

 1 



2 



2 

 8 

 1 

 14 

 3 

 8 



1594 

 2807 

 163 

 891 

 37 

 67 





2996 



10 



2024 



150 



318 



23 



36 5559 



1. Chestnuts Mated Together. — It is clear that Chestnut cannot be regarded 

 as a Mendelian recessive, since Bay, Brown, Black, and their intermediates, 

 may be produced by the union of two Chestnut individuals. The number 

 of foals not Chestnut, resulting from such unions, is 26, or about 1 in every 

 60 of the whole number observed. They were produced by 21 out of the 

 214 sires recorded, or about 1 sire in every 10 produced at least 1 foal 

 which was not Chestnut. Since the mean number of foals per sire is only 

 1594/214 = 7'4 through the period observed, the most probable number of" 



