J5 PREFACE. 



bat \vliat lias been submitted^ not to one, but often 

 to two or tbree men of the liigbest experience in that 

 particular subject. That ^' doctors will disagree" is a 

 truth which I have too often felt in the course of my 

 labours, and I can only hope that in divers difficulties 

 I have pinned my faith on the right ''doctor" at 

 last. 



10, Kensington Square, 

 August 1, 1865. 



