PKEFACE. Vll 



duced should be mentioned: these were, constant engagement 

 in general practice, much anxiety, and, though last not least, 

 ill health. These would have been sufficient to have deterred 

 many from the undertaking altogether. Although this has not 

 been the effect upon the author, yet it cannot be questioned 

 but that they have operated in some respects to the dis- 

 advantage of the work ; and he begs that it may be taken 

 neither as the measure of that of which the subject is capable, 

 nor of the author's powers of observation and description 

 exercised under more ' favourable circumstances of health, 

 leisure, and feeling. 



The author makes these few remarks not in order to 

 deprecate any fair criticism, but simply that the truth in 

 reference to the production of this work may be known in 

 justice both to the writer and the reader. 



Having said thus much in relation to the work itself, the 

 author has now the pleasing task of returning his acknow- 

 ledgments to those who have in any way assisted him in his 

 laborious though most agreeable task ; these are particularly 

 due to the following: Mr. Quekett, Dr. Handfield Jones, Pro- 

 fessor Sharpey, Mr. Tomes, Mr. Bowman, Mr. Busk, Pro- 

 fessor Owen, Mr. Canton, Dr. Carpenter, Dr. Letheby, Dr. 

 Robert Barnes, Mr. Ransom, Mr. Pollock, and Mr. Gray, of 

 St. George's Hospital, Mr. Hett, and Mr. Andrew Ross : they 

 are also due to Mr. Drewry Ottley ; Dr. RadclifFe Hall ; 

 Mr. Coppin, of Lincoln's Inn ; Messrs. Welch and Jones, of 

 Dalston ; Mr. Berry, of James Street, Covent Garden ; Mr. 

 Cowdry, of Great Torrington ; Dr. Jones, of Brighton ; Dr. 

 Chambers, of Colchester ; Mr. Milner, of Wakefield ; Mr. 

 Walker, of St. John's Street Road ; Mr. Ringrose, of Pot- 

 ter's Bar; Dr. Halpin, of Cavan ; and Mr. H. Hailey, of 

 Birmingham. 



To Dr. Letheby I hope shortly to have a second oppor- 

 tunity of rcndoring my thanks, in connection, viz., with the 



work on crystals, entitled " Human Crystallography," an 



A 4 



