3 1 8 DISEASES SECT. XXXIII. 2. le. 



enters the blood- veffels - 9 but that the morbid motions of the vef- 

 fels of the (kin around the infertion of it continue to increafe in 

 a larger and larger circle for fix or feven days , that then their 

 quantity of morbid alion becomes great enough to produce a 

 fevc-r-fit, and to affeft the ftomach by aflbciation of motions ? 

 and finally, that a iecond aflbciation of motions is produced be- 

 tween the ftomach and the other parts of the fkin, inducing 

 them into morbid actions fimilar to thofe of the circle round 

 the infertion of the variolous matter ? Many more experiments 

 and observations are required before this important queflion can 

 be fat isfadl only anfwered. 



It may be adduced, that as the matter inferted into the fkin of 

 the arm frequently fwells the lymphatic in the axilla, that in that 

 circumstance it feems to be there arrefted in its progrefs, and 

 cannot be imagined to enter the blood by that lymphatic gland 

 till the fwelling of it fubfides. Some other phenomena of the 

 diieafe are more eafily reconcileable to this theory of fympathet- 

 ic motions than to that of abforption ; as the time taken up be- 

 tween the infertion of the matter, and the operation of it on the 

 fyftenij as mentioned above. For the circle round the infertion 

 is feen to increafe, and to inflame ; and I believe, undergoes a 

 kind of diurnal paroxyfm of torpor and palenefs with a fucceed- 

 ing increafe of action and colour, like a topical fever-fit. 

 Whereas if the matter is conceived to circulate for fix or feven 

 days with the blood, without producing diforder, it ought to be 

 rendered milder, or the blood veflels more familiarized to its 

 -acrimony. 



It is much eafier to conceive from this doftrine of aflbciated 

 or fympathetic motions of diftant parts of the fyflem, how it 

 happens, that the vaiiolous infection may be received but once, 

 as before explained ; than by fuppofing, that a change is effect- 

 ed in the mafs of blood by any kind of fermentative procefs. 



The curious circumftance of the two contagions of fmall-pox 

 and meafles not acting at the fame time, but one of them reding 

 or iufpending its aftion till that of the other ceafes, may be much 

 eafiev explained from fympatht-tic or aflbciated a&ionsof the in- 

 feded part with other parts of the fyftem, than it can from fup- 

 pofing the two contagions to enter the circulation. 



The fkin of the face is fubjed to more frequent viciflitudes of 

 heat and cold, from its expofure to the open air, and is in con- 

 fequence more liable to fenfitive aflbciation with the ftomach 

 than any other part of the furface of the body, becaufe their ac- 

 tions have been .more frequently thus aflbciated. Thus in a 

 furfeit from drinking cold water, when a perfon is very hot and 

 fatigued, an eruption is liable to appear on the fae in confe- 



quence 



