CLASS IV. 2. 4. 4. OF ASSOCIATION. 43 1 



pecially if preceded by venefection and a briifc cathartic ; but i 

 the offending tooth can be detected, the mod certain cure is its 

 extraction. Thefe partial head-achs are alfo liable to return at 

 the greater lunar periods, as about once month. Five drops 

 from a two-ounce phial of a faturated folution of arfenic twice 

 a day for a week or two have been faid to prevent the returns of 

 this difeafe. See a Treatife on Arfenic by Dr. Fowler, of York. 

 Strong errhines have alfo been recommended. 



4. Epilepfix dolorifctf periodus. Chfs III. I. I. 8. The pain 

 which induces after about an hour the violent convulfions or in- 

 fanity, which conftitute the painful epilepfy, generally obferve 

 folar diurnal periods for four or five weeks, and are probably 

 governed by folar and lunar times in refpect to their greater pe- 

 riods ; for I have obferved that the daily paroxyfms, unlefs dif- 

 turbed by large dofes of opium, recur at very nearly the fame 

 hour, and after a few weeks the patients have recovered to re- 

 lapfe again at the interval of a few months. But more obfer- 

 vations are wanted upon this fubject, which might be of great 

 advantage in preventing the attacks of this difeafe ; as much lefs 

 opium given an hour before its expected daily return will pre* 

 vent the paroxyfm, than is necefTary to cure it, after it has com- 

 menced. 



5. Convulftonis dolerificx periodus. Clafs III. I. I. 6; The 

 pains, which produce thefe convulfions, are generally left after 

 rheumatifm, and come on when the patients are become warm 

 in bed, or have been for a fliort time a deep, and are therefore 

 perhaps rather to be afcribed to the increafing fenfibility of the 

 fyftem during fleep, than to foiar diurnal periods, as in Species 

 firft and fecond of this Genus. 



6. TuJJls periodic* periodus. Periodic cough, Clafs IV. 2. r, 

 9. returns at exact folar periods ; that defcribed in Sect. XXX\ 7 T. 

 3. 9. recurred about feven in the afternoon for feveral weeks* 

 till its periods were difturbed by opium, and then it recurred at 

 eleven at night for about a week, and was then totally deftroy- 

 ed by opium given in very large quantities, after having been 

 previoufly for a few days omitted. 



7. Cat amenta periodus. Periods of men flruation. The cor- 

 refpondence of the periods of the catameuia with thofe of the 

 moon was treated of in Sect* XXXII. 6. and can admit of no 

 more doubt, than that the returns of the tides are governed by- 

 lunar influence. But the manner in which this is produced, k 

 lefs evident; it has commonly been afcribed to feme effect of 

 the lunar gravitation on the circulating blood, as mentioned in 

 Sect. XXXII. 6.. But it is .more analogous to other animal 

 phenomena to fuppofe that the lunar gravl lately 



ailed* 



