( 393 ) 
is eafily prevented, by applying to the cold 
Bath after the hot. This is the true Reafoa 
why cold Baths often fucceed, when the 
hot have failed 5 for a fizy, tough, phlegmy 
Humour, muft firft be diluted, loofened, 
and diffolved by the hot Baths, then the 
cold muft brace the Mufcles, Tendons, Vef- 
fels, and Nerves. 2. Where the Difeafe is 
of the inflammatory kind, efpecially where 
the Blood makes its ftrongeft Impetus upon 
the VefTels of either the Head or Breaft, by 
the ufe of hot Baths ; in this Cafe the ani- 
mal Juices are rarefied and heated, fill and 
diftend their VefTels more, and the old Dis- 
tempers are increafed, or new ones called in 
to their Aid. Now this Increafe of febrile 
Heat, Head ach, Hedlic, &c. can neither 
be owing to the common Vehicle nor its 
Warmth, therefore muft be owing to the 
Ad million of thefe mineral volatile Princi- 
ples into the Blood. We might inftance the 
furprizing good EfFecls from bathing in na- 
tural hot Baths, for that intradiable Di lie ro- 
per by Medicine called Emphyfema, or a 
windy Dropfy, where the Swelling fhifts 
from place to place in an Hour or two, and 
is attended with aFever; where the flatulent 
vifcid Matter is attenuated by the mineral 
Spirit, diluted by the Water, and the Pores 
