358 PERIODS Sect. XXXVI. 3. 10. 



10. The periods of hemicrania, and of painful epilepfy, are 

 liable to obey lunar periods, both in their diurnal returns, and 

 in their greater periods of weeks, but are alfo induced by other 

 exciting caufes. 



11. The periods of arterial hemorrhages feem to return at 

 folar periods about the fame hour of the evening or morning. 

 Perhaps the venous hemorrhages obey the lunar periods, as the 

 catamenia, and haemorrhoids. 



12. The periods of the hemorrhoids, or piles, in fome recur 

 monthly, in others only at the greater lunar influence about the 

 equinoxes. 



13. The periods of hcemoptoe fometimes obey folar influence, 

 recurring early in the morning for {everal days ; and fometimes 

 lunar periods, recurring monthly ; and fometimes depend on 

 our hours of fleep. vSee Clafs I. 2. 1. 9. 



14. Many of the firlt periods of epileptic fits obey the month- 

 ly lunation with fome degree of accuracy j others recur only at 

 the molt powerful lunations before the vernal equinox, and after 

 the autumnal one ; but when the conftitution has gained a 

 habit of relieving difagreeablc fenfations by this kind of exertion, 

 the fit recurs from any flight caufe. 



1 5. The attack of palfy and apoplexy are known to recur with 

 great frequency about the equinoxes. 



16. There are numerous initances of the effect: of the luna- 

 tions upon the periods of infanity, whence the name of lunatic 

 has been given to thofe afflicted with this difeafe. 



IV. The critical days, in which fevers are fuppofed to termi- 

 nate, have employed the attention of medical philoiophers from 

 the days of Hippocrates to the prefent time. In whatever part 

 of a lunation a fever commences, which owes either its whole 

 -caufe to folar and lunar influence, or to this in conjunction with 

 other caufes ; it would feem, that the effect would be the great- 

 eft at the full and new moon, as the tides rife higheit at thofe 

 times, and would be the ieaft at the quadratures ; thus if a fe- 

 ver-fit fhoulu commence at the new or full moon, occafioned 

 by the folar and lunar attraction dim ini thing fome chemical af- 

 finity of the particles of blood, and thence decreasing their ftimu- 

 lus on our fanguiferous fyftem, as mentioned in Sect. XXXII. 

 -6. this effect will daily decreafe for the iirft {even days, and 

 will then increafe till about the fourteenth day, and will again 

 decreafe till about the twenty-firit day, and increale again till 

 the end of the lunation. If a fever-fit from the above can 

 fhould commence on the feveath day after either lunation, t! 

 reverfe of the above circumftances would happen. Now it 

 probable, that thofe fevers, whofe crisis or terminations are in- 

 fluenced 



