Vlll PBEFACE 



of the editor of the Cambridge Series in which this work 

 appears, but my classical friends will understand my qualms 

 when I have to describe, for instance, Burchell's zebra as Equus 

 burchelli instead of using the usual Latin form, Equus Bur- 

 chelli. I have used the form ' Prej valsky's Horse' as the 

 nearest English equivalent for Equus przewalskyi since the 

 letter-combination Prze has no phonetic significance for the 

 English reader. In Arabic words consistency was impossible, 

 for although I myself use only the vowels a, i and u in trans- 

 literation, e.g., Muhammad instead of Mahomet or Mahomed, 

 in extracts from other writers I had, of course, to preserve faith- 

 fully the forms which each employed according to his fancy. 



It only remains for me to express my gratitude to the many 

 kind friends who have aided me in various ways : Dr James 

 Cossar Ewart, F.R.S., Regius Professor of Natural History in 

 the University of Edinburgh, has given me much of his time 

 and has read through all my proofs, and twice through those of 

 the first two chapters ; whilst Mr R. I. Pocock, F.Z.S., the 

 Superintendent of the Zoological Society's Garden, Regent's 

 Park, has given me valuable aid by reading the proofs of the 

 chapter on the Living Equidae. Mr A. E. Shipley, F.R.S., 

 Fellow of Christ's College, and University Lecturer in In- 

 vertebrate Zoology, and editor of the Cambridge Biological 

 Series, has also read the proofs and has aided me with various 

 suggestions. Had it not been for their criticism and advice 

 the shortcomings of this book, of which no one can be more 

 sensible than the writer, would have been still more numerous ; 

 but for the many that remain I alone am responsible. To 

 Dr W. L. H. Duckworth, Fellow of Jesus College, University 

 Lecturer in Physical Anthropology, I am indebted for various 

 important references, and above all for having called my 

 attention to a hitherto unpublished head and neck of a quagga 

 in the Elgin Museum, which I figure and describe (pp. 438-9) ; 

 Mr A. W. Howitt, Hon. D.Sc., the well-known Australian ethno- 

 logist, of Metung, Victoria, has supplied me with the valuable 

 account of the feral horses of Eastern Victoria, which I have 

 embodied ; Dr R. S. Conway, Professor of Latin in Manchester 

 University, and late Fellow of Gonville and Caius College, 



