364 Dr. ingenhousz on the Salubrity 
air, when we were in the middle of the fea (the wind* 
blowing pretty hard, and the weather being rainy). I 
kept thefe bottles flint till next day, November 5th, 
when I examined the air confined in them at Oftend, 
and found it of an inferior quality to that which I had : 
tried on the 3d of November, in the mouth of the 
Thames; for one meafure of it with one of nitrous air 
occupied, in three different trials, 097. I found the com- 
mon air at Oftend near as good the fame day at ten 
o’clock in the morning (the weather being cloudy) ; for 
one meafure of it with one of nitrous air occupied 098. 
In the afternoon (the weather being very rainy) the com- 
mon air of the place was become worfe, though ftill of 
a very good quality ; for one meafure of it with one of 
nitrous air occupied 100, or exadtly one meafure. 
About five o’clock in the evening, the weather 
continuing rainy, and the wind blowing at that time 
very hard from the fea, I went to the fea-fhore on pur- 
pofe to gather in a phial, fitted for the purpofe, the 
fea air juft as it blew towards the land. When I had got 
it I went immediately home, and put it diredlly to the 
nitrous teft. I found, by feveral trials of fuch good 
quality, that it was nearly as good as that which I had 
met with in the mouth of the Thames; for one meafure 
of it with one of nitrous air occupied 094 and 095,. 
whereas 
