CLASS IV. 2. 4. 10. OF ASSOCIATION. 433 



diurnal solar periods, or by the increasing sensibility during sleep, 

 as mentioned in the first species of this genus. 



10. Erysipelatis periodus. Some kinds of erysipelas, which 

 probably originate from the association of the cutaneous vessels 

 with a diseased liver, occur at monthly periods, like the haemor- 

 rhois or piles; and others at annual periods, like the gout; as a 

 torpor of some part I suppose always precedes the erysipelatous 

 inflammation, the periods should accord with the increasing in- 

 fluence of terrene gravitation, as described in the introduction to 

 this Genus, and in species the seventh of it. Other periods of 

 diseases referrible to solar and lunar influence, are mentioned in 

 Section XXXVI. and many others will probably be discovered by 

 future observation. 



11. Febrium periodus. Periods of fevers. The commence- 

 ment of the cold fits of intermittent fevers, and the daily exacer- 

 bations of other fevers, so regularly recur at diurnal, solar, or 

 lunar periods, that it is impossible to deny their connection with 

 gravitation; as explained in Sect. XXXVI. 3. Not only these 

 exacerbations of fever, and their remissions, and the diurnal so- 

 lar and lunar periods; but the preparatory circumstances, which 

 introduce fevers, or which determine their crisis, appear to be 

 governed by the parts of monthly lunar periods, and of solar an- 

 nual ones. Thus the variolous fever in the natural small-pox 

 commences on the 14th day, and in the inoculated small-pox on 

 the seventh day. The fever and eruption in the distinct kind 

 take up another quarter of a lunation, and the maturation ano- 

 ther quarter. 



The fever, which is termed canine madness, or hydrophobia, 

 is believed to commence near the new or full moon; and, if the 

 cause is not then great enough to bring on the disease, it seems to 

 acquire some strength, or to lie dormant, till another, or perhaps 

 more powerful lunation calls it into action. In the spring, about 

 three or four years ago, a mad dog very much worried one swine, 

 confined in a sty, and bit another in the same sty in a less degree; 

 the former became mad, refused his meat, was much convulsed, 

 and died in about four days; this disease commenced about a 

 month after the bite. The other swine began to be ill about a 

 month after the first, and died in the same manner. 



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