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xiv 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 numerous questions—many of them put for my own private information—which I have plagued him with. He has written me fully fifty letters, 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 difficulty—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, August 10th, 1860.