PREFACE. y 



in the University of Liege, I am also greatly indebted, 

 for the measurements and figures of the prehistoric 

 skulls found in the caverns of Engis and Ingihoul, 

 in the province of Liege, Belgium. 



And I have to return my best thanks to Mr. J. 0. 

 Mitchell, Professor of Zoology at the College of 

 Agriculture at Gizeh, near Cairo, for the great trouble 

 he has taken in procuring the measurements of the 

 intestinal canals of Felis chaus {F. mffraX) and of 

 the Egyptian Domestic Cat. 



