and Miss N. Karsakoff for their courtesy and 

 kindness in granting me permission to copy 

 some of their figures; to Mr. Antony Gepp for 

 assistance in proof-reading and for the use of two 

 photographs ; to Mr. George Brebner for kindly 

 drawing for this book Figs. 10 and 79, and to 

 Mr. G. West for Fig. 87. 



Above all, I am indebted to Miss E. S. Barton 

 and Miss A. Lorrain Smith for many drawings 

 made specially for this book. 



GEORGE MURRAY. 



