326 ESSAYS AND OBSERVATIONS 



And thefe coats feera merely calculated 

 for defence againft injury, and to polTefs 

 nothing of the power we peculiarly a- 

 fcribe to nerves. 



E X P E R. XI. 



I deftroyed the brain and fpinal mar- 

 row of two frogs with a wire, and then 

 poured the folution of opium into the 

 heart and aorta of one of them, and in-^ 

 to the cavity of the abdomen of the other, 

 without perceiving any convulfions pro- 

 iduced in the mufcles of the extremities. 



REMARK. 



This experiment gives fome additional 

 weight to an opinion I have long enter- 

 tained, and for feveral years pad endea- 

 voured to eflablilh *, to wit, that, in gene- 

 ral, the nerves of the body fympathize not 

 from their connexion in their progrefs, 

 but froni their connexion at their origin. 



E X P E R. 



• In my courfe of lectures' on anatomy from the 175?, 

 downwards. 



