( 3 61 ) 
who are naturally liable to Fevers , Pains > 
Convuljions , Eruptions , Swellings , Inflam- 
mations, and Excoriations . And fuch as 
have been accuftomed to Bathing the pro- 
ceeding Summer, may fafely continue it in 
Winter. 7. Hence we know the Depth 
from v/hich the Spring which fuppjies a 
Bath arifes 5 for if it is very fuperficial, its 
Temperature varies with the Atmojphere y 
the Water being more remifsly or intenfely 
cold, as that is in any fix’d State of cold or 
hot W eather ; and fuch Baths are not ad- 
vifable, being now tepid, then cold, and 
another Time juft at the freezing Point. 
8. This Ufe of the thermometer is of fpe- 
cial Service in mineral Springs ; for when 
their Waters are affedted by, or fiudtuate 
with the Atmofphere , it is a Sign that their 
impregnating Minerals lie very fuperficial 
near the Day ; and all Digging or Ditching 
near them is dangerous, if they are of any 
great Note ; for that may either deftroy 
thofe mineral Principles which give them 
their medicinal Qualities, or lay fome Part 
of them open to the Air, whereby thefe 
Parts may be exhaled, corroded, or fome- 
how altered by that heterogeneous Body and 
its Salts y thus Sulphur Waters or Chaly- 
2 beates, 
