554 PRACTICE OF PHYSIC. 



" Besides these species of headach, in which it is doubted 

 whether they are topical fevers, there is another species, which 

 has been named since Riverius, the Cephalalgia stomachica. 

 This is explained by consent, or sympathy, which we showed 

 before not to depend on any connexion between the nerves in the 

 two parts, but upon an impression made on one part, and com- 

 municated to the other, from a particular aptitude in the last to 

 receive such : thus, the different states of the stomach are found 

 to affect the head, and may undoubtedly be the foundation of 

 headach. 



" The stomach has a particular connexion with the nerves all 

 over the system, whence it is so much affected in all fevers. 

 Crudities of the stomach are frequently found to bring back an 

 intermittent fever, after it has once ceased ; and perhaps, too, 

 to give rise to it. We may conclude then, that the same state 

 of it may bring on headach. There is another case of a 

 stomachic headach, where, from a change of the determination 

 to the uterus, the stomach is affected ; and this may be trans- 

 lated to the head, with this effect, that the pains in the stomach 

 and head become alternate with each other. Thus they may 

 continue in the stomach for some days, and then remove to the 

 head, and the stomach will be relieved : thus, in a case of a 

 headach, accompanied with an inflammation in the eyes, this 

 inflammation, and the pains of the stomach, alternated with each 

 other. 



" Besides these species of headachs, which seem doubtful, 

 there are others which are not at all of the febrile kind ; such 

 are those depending on more particular topical affections of 

 the brain, or stimuli, such as tumours, and various erosions. 

 These produce headachs of a permanent kind ; but as they are 

 liable to be increased by occasional causes, they may have exa- 

 cerbations, and so appear almost periodical, coming on at a par- 

 ticular time of the day, as towards the evening. 



" Before we proceed to speak of the method of Cure, we must 

 mention an observation of Lieutaud on this disorder. He says 

 that he cannot lay down any direct plan for the cure of headach, 

 but only mention what medicines have been used for it. What 

 he observes of this, is the state of empiricism in every disease. 



" It is easy to perceive, that there must be different methods 



