TRANSLATOR'S PREFACE. 



his own suggestion, and are literal translations of his words. In all 

 cases, however, the notes have been submitted to the Author, and 

 approved by him. 



An index too, I thought might be of service, and I have therefore 

 added a tolerably full one. 



I cannot sufficiently thank Professor Virchow for the very great 

 trouble a trouble of which nobody but myself can have any idea 

 which he has taken in revising this translation, nor for the exceeding 

 courtesy and kindness with which he has replied to the very numer- 

 ous questions many of them put for my own private information 

 which I have plagued him with. He has written me fully fifty let- 

 ters, most of them very long ones ; and when I reflect that he daily 

 passes eight or nine hours at the Charite, that he reads all the more 

 important German, French, and English medical works which appear, 

 and is besides constantly engaged in publishing something fresh, I 

 can scarcely conceive how he has managed to find time to write 

 these letters, of which a large proportion reached me by return of 

 post. 



To Dr. Harris I must return my best thanks for the assistance he 

 has rendered me in reading the proof-sheets, and correcting any 

 errors of language into which I might have fallen, and also for 

 kindly permitting me to consult him whenever I met with any diffi- 

 culty a permission of which I have availed myself most freely. 



The engravings will, I think, be found to be pretty faithful copies 

 of the original woodcuts. 



51 WIMPOLE STREET, August IQth, 1860. 



