184 ACTION OF NITRITE OF AMYL ON THE CIRCULATION. 



and further experiments must be made to determine whether 

 the walls of the arteries are the only structures consisting of 

 unstriped muscle which are affected by it. 



The further dilatation which takes place after the usual tone 

 of the vessels has been destroyed by division of the cord, seems 

 to indicate that it is of an active nature analogous to that in the 

 vessels of the penis after irritation of its nerves ; and this would 

 point rather to an affection of the nerves than of the muscular 

 fibres. In conclusion, I desire to express my warmest thanks 

 to Professor Ludwig for the great kindness he has shown 

 me, and for Jiis invaluable advice and assistance in this investi- 

 gation. 



