viii PREFACE 



All the specimens, with one or two exceptions 

 which are recorded, have been made in the laboratory 

 of St. George's Hospital. The reproductions are, 

 without exception, from original negatives. 



To those gentlemen who have kindly allowed their 

 preparations to be reproduced we wish to express 

 our thanks. We are especially indebted to Mr. 

 Harold Spitta for his assistance in the preparation 

 of the original photographs and in other ways. 

 For the great care and skill with which the original 

 photographs are reproduced we have to thank 

 Mr. A. Dent of Messrs. Dent and Co., Process 

 Engravers, Clapham. 



CHAS. SLATER, 

 EDMUND. J. SPITTA. 



October 1898. 



