310 



Scientific Proceedings, Royal Dublin Society. 



When this table is examined — the figures relating to the Coombe Arabian 

 being left out — it will be seen that in the mating of grey with other colours 

 (there are very few grey with grey matings in the table) the grey foals are 

 equal in number to all the other foals together. The actual figures are 555 

 grey, and 542 of other colours. It will also be seen that Gimcrack, Buchanan, 

 True Briton and Lincolnshire Lad II get no foals lower in the scale than brown. 

 Thus two of tlie results expected, on the assumption that the colours dealt with 

 are the result of single polygamous factors, are found actually to occur. 



A more detailed analysis of the matings of five of the foregoing sires will 

 bring out a third result, namely that the mating of grey horses carrying 

 chestnut recessive produces greys and chestnuts only. The mating results of 

 the same five horses with other colours may also be put down, as those of the 

 first four show the absence of the black colour among Thoroughbreds : — 



Colours of dams 

 Black Brown 



Grey 



The first of the expected results can be brought out by the matings 

 concerning dun, and the position of dun in the series can be determined at 

 the same time. 



Dun is a very scarce colour, more especially in registered breeds, and data 

 have been very difficult to find. In all only about 200 matings have 

 been met with, collected from the Thoroughbred, Clydesdale, and Pony Stud 

 Books and from private sources. The results are given in tlie following 

 table : — 



