APPENDIX. 261 
derable Influence in warming the Earth to 
fome Depth, notwithftanding a brisk very cold 
Eafterly Wind blew all that Day. And doubc- 
lefs the Sun has then the like Influence on 
the inner partTof Trees, whereby it agitates 
and raifes the Sap : As alfo on the inmofl: parts 
of our Bodies v/hen expofed to it, while at the 
fame time the Surface of them is pinched 
with cold Winds. And if there be any Truth 
in the common Notion, that fitting ftill for a 
confidcrable time in the Sun (hine in fuch 
Weather, is apt to caufe Agues, this may no^^ 
improbably be effected by the Influence of 
two fuch oppofice Degrees of Cold and Heat 
a£Ung on the Body at the fame time, where- 
by the Blood near the Surface for want of 
brisker Motion from Action, will be thicken- 
ed 5 which is thought to be the State of the 
Blood when an Ague Fit comes on. And that 
the Blood moves but flowly near the Surface 
of our Body, when we fit for a confidcrable 
time in the Cold, whether within Doors or 
without, we may be affured of from common 
Obfervation, viz. that tho' while we are 
thus fitting we may not be fenfible of any con- 
fiderable Degree of Cold, yet on our firfl: 
fiioving, whereby the Motion of our Blood is 
S 5 alfa 
