VOL. I-] PHILOSOPHICAL TRANSACTIONS. 131 



It is Intended that these trials shall be prosecuted to the utmost variety the 

 subject will bear: As by exchanging the blood of old and young, sick and 

 healthy, hot and cold, fierce and fearful, lame and wild animals, &c. and that 

 not only of the same but also of different kinds. For which end, and to im- 

 prove this noble experiment, either for knowledge or use, or both, some inge- 

 nious men have already proposed considerable trials and inquiries ; of which per- 

 haps an account will be given hereafter. For the present we shall only subjoin 

 some 



Considerations about Experiments of this Kind, 



1 . It may be considered in them, that the blood of the emittent animal 

 may after a few minutes of time, by its circulation, mix and run out with that 

 of the recipient. Wherefore to be assured in these trials that all the blood of 

 the recipient is run out, and none left in him but the adventitious blood of the 

 emittent, two or three or more animals (which was also hinted in the method 

 above) may be prepared and administered to bleed them all out into one. 



2. It seems not irrational to guess aforehand, that the exchange of blood will 

 not alter the nature or disposition of the animals upon which it shall be prac- 

 tised; though it may be thought worth while, for satisfaction and certainty, to 

 determine that point by experiments. The case of exchanging the blood of 

 animals seems not like that of grafting, where the scion turns the sap of the 

 stock grafted upon into its nature; the fibres of the scion so straining the 

 juice which passes from the stem to it, as thereby to change it into that of 

 the scion ; whereas in this transfusion there seems to be no such percolation of 

 the blood of animals, whereby that of the one should be changed into the na- 

 ture of the other. 



3. The most probable use of this experiment may be conjectured to be, that 

 one animal may live with the blood of another ; and consequently, that those 

 animals that want blood, or have corrupt blood, may be supplied from others 

 with a sufficient quantity, and of such as is good, provided the transfusion 

 be often repeated, by reason of the quick expense that is made of the blood.* 



An Account of some Sanative JVaters in Herefordshif^e. 

 By Dr. Beale. N' 20, p. 358. 



There are two springs, says the writer of this communication, in Herefordshire 



* When these experiments were first projected there was a degree of enthusiasm with respect to 

 the result of them, which is not uncommon on such occasions. Time, however, has shown the va- 

 nity of those expectations which philosophers then entertained as to the possibility of removing dis- 

 eases, and lengthening the natural terra of life, by such means. 



Jl2 



