4 i8 DISEASES CLASS IV. 2. 2. & 



The late Dr. Monro afferted in his lectures, that he cured the 

 hemicrania, or megrim, by a ftrong vomit, and a brilk purge 

 immediately after it. This method fucceeds belt if opium and 

 the bark arc given in due quantity after the operation of the 

 cathartic ; and with dill more certainty, if bleeding in final! 

 quantity is premifed, where the pulfe will admit of it. Sec 

 Sea. XXXV. 2. i. 



Mr. Kellie affcrts, that fome kinds of head-achs, efpecially 

 thofe which arife from defect of ilimulation, may be cured by 

 comprefhng the two iubclavian arteries, as they pafs over the 

 firft rib ; which he thinks would produce a preflure on the brain 

 limilar to that, which rnay be produced by the centrifugal force, 

 if a perfon was to lie acrofs a mill-done as it revolves. See 

 Suppl. I. 15' 7- Would fuch a circulating bed remove any 

 kind of head-ach ? 



The pain generally afreets one eye, and fpreads a Ititle way 

 on that ikie of the nofe, and may ibmetimes be relieved by preff- 

 ing or cutting the nerve, where it paffes into the bone of the 

 orbit above the eye. When it affects a fmall defined part on 

 the parietal bone on one fide, it is generally termed Clavus hyf- 

 tericus, and is always I believe owing to a difeafed dens mola- 

 ris. The tendons of the mufcles, which ferve the office of 

 madication, have been extended into pain at the fame time that 

 the membranous coverings of the roots of the teeth have been 

 compreiTed into pain, during the biting or maftication of hard 

 :s. Hence when the membranes, which cover the roots of 

 ;eth, become affected with pain by a beginning decay, or 

 perhaps by the torpor or coldncfs of the dying part of the tooth, 

 the tendons and membranous fafcia of the mufcles about the 

 fame fide of the head become affected with violent pain by their 

 live ailbciations : and as ibon as this aflbciated pain takes 

 place, the pain of the tooth entirely ceafes, as explained in the 

 fecond fpecies of this genus. 



A remarkable circumdance attends this kind of hemicrania, 

 viz. that it recurs by periods like thofe of intermittent fevers, as 

 explained in the Section on Catenation of Motions ; theie peri- 

 ods ibmetimes correfpond with alternate lunar or folar days 

 like tertian agues, and that even when a decaying tooth is evi- 

 dently the caufe ; which has been evinced by the cure of the 

 difeale by extracting the tooth. At other times they obferve 

 the monthly lunations, and feem to be induced by the debility, 

 which attends menftruation. 



The dens fapientke, or lad tooth of the upper jaw, fre- 

 quently decays fird, and gives hemicrania over the eye on the 

 fame fide. The fird or fecond grinder in the under-jaw is lia- 

 ble 



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