A 



08 DISEASES Class II. 1. 3. 10, 



become hereditary. Which incapacity of receiving a fecond 

 time the fmall- pox may be explained from the general law of an- 

 imation, that flimuli greater than natural lofe their effect by 

 habit, or from their being too violently or too frequently applied. 

 As the cow-pox is fold to be fo favourable to infants, great 

 benefit might accrue to mankind by their early inoculation, 

 which mieht in time exterminate the fmall-pox. This mieht 

 be perhaps effected by eflablifhing a difpeufary in towns, and 

 even villages, and allowing a premium of a few (hillings to eve- 

 ry one of the poor who ihould be thus inoculated, as well as their 

 daily fnitenance for eight or ten days, that their arms might be 

 infpecled by a furgeon, to afcertain that they underwent the 

 genuine difeafe. 



10. Rubeola irritatci) morbllli. The meafles commence with 

 freezing, red eyes, dry hoarfe cough, and are attended with fen- 

 iitive irritated fever. On the fourth dav, or a little later, fmall 

 thick eruptions appear, fcarcely eminent above the fkin, and, af- 

 ter three days, changing into very fmall branny fcales. 



As the contagious material of the fmall-pox may be fuppofed 

 to be difFufed in the air like a fine dry powder, and mixing with 

 the faliva in the mouth to infect the tonfils in its paffage to the 

 ftomach ; fo the contagious material of the meafles may be fuppo- 

 fed to be more completely diilblved in the air^ and thus to impart 

 its poifon to the membrane of the noltrils, which covers the fenfe 

 of fmell ; whence a catarrh with fneezing ufhers in the fever ; 

 the termination of the nafal duel: of the lachrymal fac is fubjec"fc 

 to the fame ftimulus and inflammation, and affects by fympathy 

 the lachrymal glands, occafioning a great flow of tears. See 

 Seel. XVI. 8. And the rednefs of the eye and eyelids is pro-* 

 duced in confequence of the tears being in fo great quantity, 

 that the faline part of them is not entirely reabforbed. See 

 Sea. XXIV. 2. 8. 



The contagion of the meafles, if it be taken a fufiicient time 

 before inoculation, fo that the eruption may commence before 

 the variolous fever comes on, flops the progrefs of the fmall-pox 

 in the inoculated wound, and delays it till the meafle-fever has 

 finifhed its career. See Seel:. XXXIII. 2. 9. 



The meafles are ufually attended with inflammatory fever 

 with flrong pulfe, and bear the lancet in every flage of the dif- 

 eafe. In the early periods of it, venefeclion renders the fever 

 and cough lefs j and, if any fymptoms of peripneumony occur, 

 is repeatedly neceffary ; and at the decline of the difeafe, if a 

 cough be left after the eruption has ceafed, and the fubfequent . 

 branny fcales are falling of, venefeclion fhould be immediately 

 ufed ; which prevents the danger of confumption. At this time 



alfo 



