S*CT. XXXIII a. DISEASES OF SENSATION. 459 



contagions attended with fever can be received but 

 once, feems to depend on their being rather local 

 difeafes than univerfal ones, and are hence not at- 

 tended with fever, except the purulent fever in their 

 laft llages, when the patient is deftroyed by them. 

 On this account the whole of the fyftem does not 

 become habituated to thefe morbid adions, fo as to 

 ceafe to be affected with fenfation by a repetition of 

 the contagion. Thus the contagious matter of the 

 Venereal difeafe, and of the tenia, affects the lym- 

 phatic glands, as the inguinal glands, and thofe 

 about the roots of the hair and neck, where it is 

 ar retted, but does not feem to affect the blood- 

 reffels, fmce no fever enfues. 



Hence it would appear, that thefe kinds of con- 

 tagion are propagated not by means of the circula- 

 tion, but by fympathy of diftant parts with each 

 other ; fince if a diftant part, as the palate, 

 fhould be excited by fenfitive affociation into 

 the fame kind of motions, as the parts originally 

 affected by the contact of infectious matter ; that dif- 

 tant part will produce the fame kind of infectious 

 matter ; for every fecretion from the blood is formed 

 from it by the peculiar motions of the fine ex- 

 tremities of the gland, which fecretes it ; the vari- 

 ous fecreted fluids, as the bile s faliva, gaftric juice, 

 Hot previouily exifting, as fuch, in the blood- vef- 

 fels. 



And this peculiar fympathy between the genitals 

 the throat, owing to fenfitive affociation, ap- 

 pears not only in the production of venereal ulcers 

 in the throat, but in variety of other inttances, as 

 in the mumps, in the hydrophobia, fome coughs, 

 ftrangulation, the production of the beard, change 

 of voice at puberty. Which are further defcribed 

 inClafsIV. i. 2.7. 



To evince that the production of fuch large quan- 

 tities of contagious matter, as are Teen in fome 



H h variolous 



