394 Mr. "Wilson *s farther Experiments on Cold. 
the fnow colledted from the furface. But in oppofition to both 
' thefe views it remains now to be mentioned, that nothing of 
this kind did appear in the courfe of the experiments, which 
Indeed were contrived chiefly to detect fuch circumftances. 
If therefore the arguments produced in both papers upon 
this fubjedt will not allow us to account for fo remarkable a 
cooling procefs by an evaporation at the furface of the fnow, 
it would appear, that there remains ftill fomething unknown 
with refpect to the caufe. A proper inveftigation of this mat- 
ter, in climates favourable to fuch experiments, may poffibly 
unfold fome farther properties of heat with which at prefent 
we may be wholly unacquainted* 
