( i84 ) 
when the Air was very ftill from Wind, in proportion to 
what went away when there blew a ftronggaie,ahhougti 
the Experiment w^re made, as I faid, in a place as dole 
from the Wind as could well be contrived. For which 
reafon I do not at all doubt, that had the Experiment 
been made where the Wind had come freely, it would 
have carried away at leaft three times as much as we 
found, without the affiftance of the Sun, which might 
perhaps have doubled it. By the (ame Experiment it 
likewife appears, that the Evaporations in M,:)^ June^ 
Julyy and Augujl ^s^\\\c\\ are nearly equal, are about three 
times as much as what evaporated in the four Months 
of Novemler, December^ January^ and February^ which 
are likewife nearly equal : March and ^/>r// anfwering 
nearly to September October, This Fleece of Va- 
pour in ftill Weather hanging on the furface cf the Wa- 
ter, is the occafion of very Urange Appearances by the 
refraflion of the faid Vapours differing from that of the 
Common Air, whereby every thing appears raifed; as 
Houfes like Steeples, Ships as on Land above the Water, 
and the Land raifed, and as it were lifted from the Sea, 
and many times fecmigg to over- hang. And this may give 
a tolerable Account cf what I have heard of feeing the 
Cattle at High vjater^ time in tht ljle of Dogs from Gree^t- 
ivich^ when none are to be feen at Low-water, ( which 
fome have endeavoured to explain by luppofmg the Ifle 
of Dogs to have been lifted by the Tic/e coming under 
ir.) But the evaporous effluvia of Water, having a grea- 
ter degree of refraction than the Common Air, may fuf- 
fice to bring thofe Beams down to the Eye, which when 
the Water is retired, and the Vapours fubllded with it, 
pafs above, and confequently the Objefts feen at the 
one time, may be conceived to difap.pear at the other. 
A 
