Your excellent work on the _Diseases of the Army_, so useful to physicians in general, will always be considered as a standard for the practice of those in particular, who are intrusted with the important office of superintending the health of the soldiery. Mr. Bilguer has performed, on his part, what you have so ably done on yours, in pointing out to his colleagues and successors, the plan which they ought to follow. It has given me pleasure to translate his Dissertation, and you must derive a peculiar satisfaction from the perusal of it, because, from the extensive and painful experience you have had of the bad consequences resulting from the operation this able Surgeon so warmly opposes, you can more readily perceive the usefulness and value of this little work. It is therefore my duty to address it to you, and I eagerly embrace so favourable an opportunity of thus publicly declaring the sentiments of esteem and particular respect, with which I have the honor to be, SIR, Your most humble, and Most obedient Servant, TISSOT. Lausanne, 1 April, 1764. PREFACE, By DR. TISSOT. An extract of the Dissertation, of which I now publish a Translation, had given me a very high opinion of it; but on a perusal of the whole, I found it still better than I had imagined: It seemed to me one of the most useful and best executed performances on Surgery, and I hoped it would very soon be translated into French. Eighteen months having elapsed without any such translation appearing, I thought of procuring one. I then endeavoured to find a translator, but failing in that, I determined to do the office my self. I imagined, that, in thus dedicating a few hours of my time to this work, I should do a considerable service to many unfortunate people. I shall rest well satisfied if, by rendering this excellent book more common, I prove the means of adding to its influence, and of inducing a great number of surgeons, who may now read it, to quit the cruel and fatal practice of amputation, for the method which Mr. Bilguer proposes, with a degree of sincerity and precision which leaves no room for doubt. The title of the original is, _Dissertatio inauguralis medico-chirurgica, de membrorum amputatione, rarissime administranda aut quasi abroganda, quam, pro gradu doctoris medecinæ et precipue chirurgiæ rite consequendo, die vigesima una Martii, A. S. 1761. In alma Regia Fridericiana speciminis loco, publicæ eruditorum censuræ submisit_, JOHANNES ULRICUS BILGUER, curia-rhœtus _generalis præfectus chirurgorum exercitûs regii Borussici_.