LECTURE V. Q33 



in the larger trunks, in a manner which I 

 had never before seen demonstrated, except 

 by injections of quicksilver. In dissecting 

 this hand, the vessels which transmitted 

 the injection from the arteries into the 

 veins were apparent. Some artifice is, 

 however, necessary to our success, in 

 making these preparations. We should 

 suffer a part to become slightly putrid, be- 

 fore we inject its vessels, which produces a 

 yielding state of them, favourable to the 

 transit of the injection. Yet there are arte- 

 ries which terminate in veins, so small, as 

 not, in their natural and healthy state, to 

 transmit even coloured blood, so that there 

 is, in fact, something similar to a specula- 

 tion of Boerhaave's, something like a de- 

 scending series of vessels. It also evidently 

 appears, that the great mass of the blood is 

 freely transmitted from the arteries into 

 the veins, so that it rapidly and regularly 

 circulates ; and we therefore conclude, that 

 but a small portion passes into the finer 

 vessels, there to undergo those modifica- 

 tions which fit it for the production of the 

 secretions, and the various materials for 

 the nutriment of the body. 



