PART III. 



OF SEVERAL APPEARANCES CON- 

 NECTED WITH DEW. 



1HERE are various occurrences in nature, 

 which seem to me strictly allied to dew, though 

 their relation to it be not always at first sight 

 perceivable. The statement and explanation 

 of several of these will form the concluding part 

 of the present Essay. 



I. I observed one morning, in winter, that 

 the insides of the panes of glass in the windows 

 of my bedchamber were all of them moist, but 

 that those, which had been covered by an inside 

 shutter, during the night, were much more so, 

 than others which had been uncovered. Sup- 

 posing, that this diversity of appearance de- 

 pended upon a difference of temperature, I ap- 

 plied the naked bulbs of two delicate thermo- 

 meters to a covered and uncovered pane 5 on 

 which I found, that the former was 3 colder 

 than the latter. The air of the chamber, though 

 no fire was kept in it, was at this time 11 5 



