54 PROPERTIES OF 



in jellying ; and when the contrary takes place, or when the 

 second or third cup is more sizy than the preceding, I am per- 

 suaded that upon a careful examination, instead of weakening, 

 they will be found to strengthen my inference ; as will appear 

 probable by the following case, which has occurred since these 

 experiments were published in the 'Philosophical Transactions/ 



EXPERIMENT XXVII. 



On the 13th of June, I visited a young man, twenty -two 

 years old, of an athletic habit, who complained of a violent pain 

 in his head and back, with a full strong pulse ; but as he was 

 then in a profuse sweat, which had been preceded by a shiver- 

 ing, it was not thought proper to bleed him, and the rather, as 

 we were informed, that he had had a similar paroxysm two days 

 before. But next day, finding that his fever had not left him 

 with the sweat, and that he still had a pain in his head and 

 back, and that his pulse, though not now full and strong, yet 

 was quicker than natural, it was then judged necessary to take 

 away some blood. Upon opening the vein, the blood flowed 

 very slowly, and indeed merely trickled down his arm. Ima- 

 gining that the bandage might be too tight, I slackened it, but 

 still the motion of the blood was not accelerated. I then asked 

 him whether he had not been afraid of the bleeding, and he 

 told me he had ; and on feeling his pulse in the other arm, I 

 found it very low. I therefore desired him to move the muscles 

 of his hand, which he did ; but nevertheless so slowly did the 

 blood run, that it was four minutes before I got an ounce and 

 a half into a cup. I then stopped the orifice till another cup 

 was brought, into which the blood ran in a full stream, to the 

 quantity of three ounces, and that in two minutes, although the 

 orifice was rather small, so much was its velocity now increased. 

 Into the third cup, which likewise held three ounces, the blood 

 ran still faster, as it was filled in less than two minutes. By 

 this time the patient beginning to be faint, I stopped the bleed- 

 ing till he could lie down on the floor, and then about three 

 drachms more of blood were received into a fourth cup : this 

 came away very slowly, and the bleeding stopped of itself. 

 He drank a glass of water, and did not faint, and he appeared 

 afterwards to be much relieved by the evacuation. Upon this 

 blood I made the following remarks : 



