334 ESSAYS and OBSERVATIONS 



large arteries are provided with nerves 

 diftributed on their inner coat. 



E X P E R. XIV. 



Having obferved the effedls the folu* 

 tion has when poured into the heart, we 

 are now to try, it, in fa6t, it is abforb- 

 ed and mixed with the blood, and if it 

 produces obfeyvabie effedls in confequence 

 pf this. 



This is to be known by deft roying the 

 nerves of any part in their progrefs to it, 

 or at their origin ; and then observing the 

 effeds of opium applied to it. Both thefe 

 ways were tried as follows. 



After cutting, in four frogs, all the 

 nerves which ilTue from the pofterior end 

 of the fpine to be diftributed to the pel- 

 vis and hind extremities, Ipafted a thread 

 clofe behind the large blood-veftfels, be- 

 tween them and the bones of the loyns, 

 and then tied this thread faft around the 

 (kin and mufcles of the loyns : Thus cut- 

 png or tying the intercoftal nerves, which 



alone 



