VOL. I.J PHILOSOPHICAL TRANSACTIONS. 12^ 



head (out of which the second dog's own blood must run into dishes.) These 

 two quills being put in and tied fast, stop them with a stick till there be occasion 

 to open them. 



All things being thus prepared, tie the dogs on their sides towards one another 

 so conveniently that the quill may go into each other, (for the dogs' necks cannot 

 be brought so near, but that you must put two or three several quills more into 

 the first two to convey the blood from one to another.) After that unstop the 

 quill that goes down into the first dog's jugular vein, and the other quill coming 

 out of the other dog's artery ; and by the help of two or three other quills put 

 into each other, according as there shall be occasion, insert them into one 

 another. Then slip the running knots, and immediately the blood runs through 

 the quills as through an artery very impetuously. And immediately as the blood 

 runs into the dog unstop the other quill, coming out of the upper part of his 

 jugular vein (a ligature being first made about his neck, or else his other jugular 

 vein being compressed by one's finger ;) and let his own blood run out at the 

 same time into dishes, (yet not constantly, but according as you perceive him 

 able to bear it) till the other dog begin to cry and faint, and fall into con- 

 vulsions, and at last die by his side. 



Then take out both the quills out of the dog*s jugular vein, and tie the run- 

 ning knot fast, and cut the vein asunder, (which you may do without any harm 

 to the dog, one jugular vein being sufficient to convey all the blood from the 

 head and upper parts, by reason of a large anastomosis, whereby both the jugular 

 veins meet about the larynx.) This done, sow up the skin and dismiss him, and 

 the dog will leap from the table and shake himself and run away, as if nothing, 

 ailed him.' 



And this I have tried several times, before several in the universities, but 

 never yet upon more than one dog at a time for want of leisure and convenient 

 supplies of several dogs at once. But when I return I doubt not but to give you 

 a fuller account, not only by bleeding several dogs into one, but several other 

 creatures into one another, as you did propose to me before you left Oxford; 

 which will be very easy to perform, and will afford many pleasant and perhaps 

 not unuseful experiments. 



But because there are many circumstances necessary to be observed in the 

 performing of this experiment, and that you may better direct any one to do it 

 without any danger of killing the other dog that is to receive the other's blood, 

 I will mention two or three. 



First, That you fasten the dogs at such a convenient distance, that the vein 

 nor artery be not stretched ; for then being contracted, they will not admit or 

 convey so much blood. 



VOL. I. R 



