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PREFACE.

I FEEL it necessary to explain the reasons which have induced me to publish these Lectures in a separate form. In the spring of 1847 I was honoured by being appointed one of the Lecturers at the Royal College of Physicians, and chose for my subject Electricity and Galvanism in relation to Physiology and Therapeutics. These Lectures were fully reported in the London Medical Ga

zette.

Since their appearance in the pages of that journal I have been repeatedly urged to publish them as a distinct work, but could never bring myself to regard them of sufficient importance for that purpose. A short time since, however, I was applied to on the same subject by the excellent publishers of the Gazette, who informed me that there had been a considerable demand for the numbers of the journal in which these Lectures had appeared.

I have been thus encouraged to carefully revise and somewhat extend them, and have added some fresh illustrations, so that I venture to entertain a hope that this little volume may not be unworthy of perusal nor destitute of utility.

Myddelton Square,

Oct. 1. 1849.

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