( 917 ) 
tLe refinance of the contained fluid, there is lefs tiine re* 
quired for their reftitution , by their Elaftick force, Fo^' 
inftance, if the Circle A be the Cavity 
of the A^rterial Cylinder in its Natural 
Sjfftale, and the Circle C the Cavity in /// - 
its great eft Diaftole^ and Dthefpacejj/ rTl3^ 
the Coats of the Artery pafs thro in \\V J rj^ 
their alternate motion. If again B be vS^illll^^^^ 
the Cavity of the Artery, when it is .^--^ 
diltended.by the Intumefcence of the Arterial Biood, and 
E be the Diftance which the Coats of the Artery pafs 
thro, is it not plain they (hall defcribe the Line E tv7ice 
in the fame time they do the other once,_ and confequent- 
]y there be two Pulfations inftead of one. Hence he 
thinks he may conclude againft all who deny the Organs 
to have any concern in this affair, That a Fever is an 
Unnatural and Violent Tenfion of the Blood Veffels, 
which caufes a quick motion in the Heart and Arteries, 
and diforders all the Animal Funftions. 
. Now, fince the Intumefcence or fvvelling of the Blood 
is occafioned by too Plentiful Nutrition, the Suppreilion 
of fome Evacuation, or the Mixture of fome Impure 
Matter, which excites a Fermentation, and one of thefe 
muft be the immediate caufe. of all Fevers v/h'itever, 
confequently laying afide the ancient deftribution of Fe- 
vers into Ephemeral, Putrid and Heftick, they are more 
rightly divided into Sanguinary, and Humoral. The firit 
are fijch as arifefrom an exceffive quantity of Blood, or 
fome ur.:jfo3.1 Fermentation of it. T5e. latter are fuch as 
proceed irom fome Impurities, or fome Heterogeneous 
Mixture^ exciting a violent Effervefcence in the Vital 
Liquor. 
■ Having thus explained the Nature of a Fever, its 
Caufes and Kinds, ic remains to. compare the Sympronis 
and Method of Cure, which M> Gavet thinks admirably 
conduce to illuftrate and confirm the Truth, of his Sy- 
ftem. H h h h h h 2 . 2. D. 
