( 366 ) 
Brooks, are near a Medium between the 
freezing Point and Body’s Heat in a healthy 
State at Reft ; and Matlock the Medium 
between artificial Freezing and the Hot 
Bath; Middleton's are near the Medium, 
between artificial Freezing, and the Heat 
of a young Perfon in an acute ardent Fe- 
ver. Then we fee the different Tempera- 
tures of the Air at the fame time of the 
Day, within three Miles Diftance, viz. 
on the Top of the Mountain or Promon- 
tory of Crofsfell y and in the Valley below, 
the firft being 29, the laft 50. 15. Since 
there is fuch Difference in the Depth of 
the Origin of Springs, there may be, and 
are, Abundance both of medicinal and 
common Water Fountains, which never 
come to the Day, but are conveyed by fub- 
terranean Chinks or Chafms, to fome large 
Collection of Waters, as the Sea, Rivers, 
&c. 16. Perhaps if the fundry Tempera- 
tures of Waters produced by the fundry 
Earths, Foffils and Minerals, both Ample 
and compounded, were exactly known, it 
might be one Mean or Affiftant towards 
difcovering feveral Minerals, whofe Parts 
not being diflblvable in Water, no Mark 
of 
