252 STUDIES IN THE EVOLUTION OF ANIMALS 



this, seeing that Fig. 90 () could stand for the hand of an Ox or 

 Ram. As shown in (c\ it does not materially differ from it. 



A third case of cloven hoof in the Horse was pointed out to me 

 by Professor M'Fadyean of the Royal Veterinary College, and 



FIG. 90. (a) Abnormal hand of a Horse ; (b] abnormal hand of a Colt, split into two 

 digits, like that of a Ram, from Chauveau's Anat. Comp., p. 130; (c] normal hand of an 

 Ox, from Professor M'Fadyean's Compar. Anat. of Dom. Animals, Fig. 87. 



illustrated in the Journal of Comparative Pathology and Therapeutics^ 

 vol. iii. pt. 3, September 1890, p. 263. 



B. The fourth abnormality we have to face is this : All osteolo- 

 gists know that long bones have a nutrient foramen for the passage 

 of an artery into the interior of the bone. Well, Professor 

 M'Fadyean, in his work on The Horse, on p. 153, Fig. 113, gives 

 the left metatarsal bone of a Horse with two nutrient foramina 

 where generally there is only one. 



