6* DISEASES Class I. 2. 1. i£. 



born with the eruption on them. The blood in the fmall pox will 

 not inoculate that difeafe, if taken before the commencement of 

 the fecondary fever ; as fhewn in Seel:. XXXIII. 2. 10. becaufe 

 the contagious matter is not yet formed, but after it has been 

 oxygenated through the cuticle in the puftules, it becomes con- 

 tagious j and if it be then abforbed, as in the fecondary fever, 

 the blood of the mother may become contagious, and infed the 

 child. The fame mode of rcafoning is applicable to the chicken 

 pox. See Clafs IV. 3. 1. 7. 



15. Scorbutus. Sea-fcurvy is caufed by fait diet, the perpet- 

 iial ftimulus of which debilitates the venous and abforbent fyf- 

 tems ; and may alfo be promoted by the fea-air, which is known 

 to be fo injurious to moil vegetables, which grow near the coafts, 

 and has been perhaps incautioufly recommended to confumptive 

 patients. See Clafs II. 1. 6. 7. Hence the blood is imperfect- 

 ly taken up by the veins from the capillaries, whence brown 

 and black fpots appear upon the {kin without fever. The limbs 

 become livid and edematous, and laftly ulcers are produced from 

 deficient abforption. See Seel. XXXIII. 3. 2. and Clafs II. 1. 

 4. 13. For an account of the fcurvy of the lungs, fee Seel. 

 XXVII. 2. - 



M. M. Frefh animal and vegetable food. Infufion of malt 

 New beer. Sugar. Wine. Steel. Bark. Sorbentia. Opium ? 



16. Vibices. Extravafations of blcod become black from their 

 being fecladed from the air. The extravafation of blood in 

 bruifes, or in fome fevers, or after death in fome patients, ef- 

 pecially in the parts which were expofed to prefiure, is owing 

 to the line terminations of the veins having been mechanically 

 comprefled fo as to prevent their abforbing the blood from the 

 capillaries, or to their inactivity from difeafe. The blood when 

 extravafated undergoes a chemical change before it is fufficient*- 

 ly fluid to be taken up by the lymphatic abforbents, and in that 

 procefs changes its colour to green and then yellow. 



17. Petechia. Purple foots. Thefe attend fevers with great 

 venous inirritabilitv, and are probably formed by the inability 

 of a fingle termination of a vein, whence the correfponding 

 capillary becomes ruptured, and effufes the blood into the cellu- 

 lar membrane round the inert termination of the vein. This is 

 generally efteemed a fign of the putrid ftateof the blood, or that 

 ftate contrary to the inflammatory one. As it attends fome in- 

 flammatory difeafes which are attended with great inirritabilitv, 

 as in the confluent fmall pox. But it alfo attends the fcurvy, 

 where no fever exifls, and it therefore fimply announces the in- 

 aclivitv of the terminations of fome veins ; and is thence indeed 

 $, bad fymptom in fevers, as a mark of approaching inactivity ox 



As 



