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



pecially if preceded by venefection and a brifk cathartic •, but if 

 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 Treat ife on Arfenic by Dr. Fowler, of York. 

 Strong errhines have alfo been recommended. 



4. Epilepfidt dolorifica periodus. Clafs III. 1. 1. 8. The pain 

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

 fanity, which conftitute the painful cpilepfy, 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 j for I have obferved that the daily paroxyfms, unlefs dis- 

 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 dolorijica period us. 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 fhort time afleep, and are therefore 

 perhaps rather to be afcribed to the increafing fenfibility of the 

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

 firft and fecond of this Genus. 



6. TuJJis periodica periodus. Periodic cough, Clafs IV. 2. I. 

 9. returns at exact folar periods ; that defcribed in Sect. XXXVI. 

 3. 9. recurred about (even in the afternoon for feveral v/eeks, 

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

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

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

 previoufly for a few days omitted. 



7. Catamenia periodus. Periods of menltruation. The cor- 

 refpondence of the periods of the catamenia with thole 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, is 

 lefs evident j it has commonly been afcribed to fome 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 gravitation immediately 



arrects 



