( 7*o 3 
of the Crifis, and gives the reafon why immoderate 
Heat is a great hindrance of Sweating as well as Cold. 
He fays but little of the Febris Ephemera, w hich is 
the only Fever which arifes from an evident Caule alone, 
as Motion, Heat, Intemperance, &c. This may dege- 
nerate into an Intermitting or Malignant Fever, and hatli 
no Pathognomonic Sign by which it is diftinguiiVd from 
other Fevers befides its Duration, and hath but one In- 
dication. 
When he comes to fpeak of intermitting Fevers, he 
gives us another Argument to prove their Caufe is a 
Poyfon, and that is, becaufe it produces the fame Sym- 
ptoms which other Poyfons do, to wit, Faintnefs, Vo- 
miting, Univerfal Sicknefs, Spafmodick Pains, But 
< this is (6 mild a Poyfon, that the Animal Spirits are rather 
vex'd and irritated, than deftroy'd by it, and by their 
own Elafticity rid themfelves of it in a ftfort time. This 
Poyfon, he (ays, cannot be lodg'd in any part of the 
Body, except in the Fibres, becaufe the whole Body 
being vafcular, the Blood circulating perpetually thro' 
all the parts, would otherwife be put into a continued 
Feverilh Commotion; but in the Fibrous Filaments it is 
at liberty to put the Spirits into Periodical Explofions. 
Speaking of the Procatar&ic Caufes of Intermitting Fe- 
vers, he acquaints us how they come to be Endemicaf 
in fbme places, and why thofe who feem equally liable 
to this Diftemper from the evident Caufes ot it, are not 
equally ftized with it. Then he fblves the Phenomena 
of the Symptoms with great Perfpicuity, difcourfes of 
the Duration of this Fever, and (hews, that the Cortex 
Peruv. is not the qccafion of the frequent Returns of 
this Difeafe, and proves that the Ferments of Quotidian, 
Tertian and Quartan Interoiittents are not fpecifieally 
different. 
He 
