vi PREFACE 



Trouessart; Mr. Theodore A. Cook both in his 

 private capacity and as editor of The Field Prof. 

 J. C. Ewart, and several other friends and corre- 

 spondents. 



Since the text was in type, Mr. R. I. Pocock 

 has pointed out (The Field, Jan. 20, 1912, p. 143) 

 that the aperture of a scent-gland situated on the 

 posterior aspect of the hind-foot of the Indian rhino- 

 ceros occupies a position very nearly similar to that 

 of the ergot in the foot of the horse (infra, p. 41). 

 " The .orifice of [this gland," he writes, "is placed 

 suggestively near the spot corresponding to that 

 occupied by the ergot in horses, and despite the 

 accepted view that the ergot is a sole of the. foot, 

 the possibility of its representing an aborted gland 

 may be wisely borne in mind. Its general resem- 

 blance to the warts or chestnuts on the legs of 

 horses, which most authorities regard as degener- 

 ated glandular structures, is quite in keeping with 

 this suggestion." 



R. LYDEKKER. 



HARPENDEN LODGE, HERTS, 

 January 1912. 



