230 



Inheritaitce in Thoronghhred Horses 



greys, while in the recent .studliooks thesp percenUiges tire hardly 2 i«r cent. and '5 to 1 

 per Cent, respectively. In the ciirly colour records the finer distinctions, e.g. "black or 

 brown," "bay or chestnut," etc., of the mixiern temiinology rarely appear, but this is not 

 of importance. A tbousand cases were taken for ejich series, and the correlation Tables I. to IV. 

 were constructcd a.s in Peai-soii and Braniloy-Mo<jre'.s nienioir ou Inheritance of Coat-Colour 

 in Hurse»*, in fact the niethod there u.'^ed w.us foUowed iilentically, the fourfold division between 

 chestnut and V>a}' being lused for the short tables. Tiie fiitlowing i-esults were obtained, the 

 Dotation being that of Professor Pearson's nienioir : Un the Correlation of C'haracters not quanti- 

 tative! i/ measurahle t. 



(2) Table I. reduces to 



Patemal Grandams. 



This gives : 



/i = -4070105, /r= -3672283, 



/• = -4509851, A' = -3603667, 

 and the equation : 



-3212093 = r+ 0917778^- + -1 107746r3 + -0606283;-' 



+ -0308582r^ + -0443421r«+ -0101909r' + •0339243r«+etc. 

 the root of which is 



r=-3085. 



From Table II. \ve have 



c 

 ü 



giving : 



Maternal Grandams. 



A= -6341 100, 5^=3300624, 

 /-= -4901880, A' = -3537792, 



• Phil. Tran». A, Vol. 195, pp. 92 et seq. 

 + Phil. Tran». A, Vol. 195, pp. 1 — i7. 



