KRIODS OF DISEASES SECT. XXXVI. 4, 



governed by the times required for certain chemical 

 changes in the blood, which affect or alter the fti- 

 mulus of the contagious matter, but from the daily 

 increafing or decreafing effect of this lunar link of 

 catenation, as explained in Section XVII. 3. 3. And 

 as other fevers terminate moil frequently about the 

 feventh, fourteenth, twenty-firft, or about the end 

 of four weeks, when no medical afliftance has dif- 

 turbed their periods, I conclude, that thefe crifes, 

 or terminations, are governed by periods of the lu- 

 nations, though we are ftill ignorant of their manner 

 of operation. 



In the diflinft fmall-pox the veftiges of lunation 

 are very apparent, after inoculation a quarter of a 

 lunation precedes the commencement of the fever, 

 another quarter terminates with the complete erup- 

 tion, another quarter with the complete maturation,, 

 and another quarter terminates the complete abforp~ 

 tion of a material now rendered inoffenfive to the 

 confiitution* 



SECT, 



