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der the use of it safe and beneficial. Of the number of these seems to be that French Virtuoso, Gasper de Gurye de Montpoly, who in a late Letter of his to Monsieur Bourdelot, declares to the World, that this is a very Ingenious Invention, and such an one, as may prove very useful; but withall, that, in his opinion, it is to be used with much caution, as not being like to be practised innoxiously, if imprudent men do mannage it, and the concourse of two differing sorts of Blood requiring many tryals, and a careful observation of many circumstances, to give assurance. He supposes, that the Blood of every Animal is endowed with its peculiar Temper, and contains in the Aggregate of its parts, different natures, principles, figures, and even different Center. Whence he concludes, that two Substances thus differing, and containing plenty of Spirits, are not reducible to one and the same Center, nor to one and the same Body without Fermentation; and that this Operation may prove of danger to him, that shall have admitted into his Veins a strange Blood (wont to be free in its native Vessels) without passing through those degrees, that must give it Impressions sutable to the temper and functions of the Vitals of the Recipient: And taking for granted, that no considerate man will hazard a Total Transfusion, he acknowledges that a Partial one may be in some cases and sicknesses very useful; provided; it be practised circumspectly, upon a Body yet strong enough, and in a moderate quantity, so as the Spirits and Blood of the Recipient may be able to dissolve and master the transfused strange Blood, and convert the same into its own nature by a gentle Ebullition; to obtain by such a commixture principle of motion, that may cause a better habit of Body. And he believes, that this Ebullition must always happen in Bloods of differing parts and qualities; and that very hardly two Animals, of differing species, ages and tempers, will be met with, that have Blood so like one another, as not to need Fermentation, to make a requisit mixture. He doubts not, that if a substance could be found so resembling that of our Spirits, as that it would immediately unite it self with them, not needing any alteration, the Transfusion of such a Substance would be capable to produce effects little less than miraculous, by relieving the prostrated
forces
