Vegetable Stanch 



55 



O 



in fquare inches 5 thefe 180 grains bcin 

 equally fpread on this furface, its depth will 



be ,f, part of an ineh = —J^.I found 



the depth of Dew in a winter night to be the 

 £ part of an inch ; fo that if we allow 1 5 1 

 nights for the extent of thefummer's Dew, it 

 will in that time arife to one inch depth. And 

 reckoning the remaining 214 nights, for the 

 extent of the winter's Dew, it will produce 

 2. 39 inches depth, which makes the Dew 

 of the whole year amount to 3. 39 inches 



depth. 



And the quantity which evaporated in a 



fair fummer*s day from the fame furface, 

 being 1 ounce -J- 282 grains, gives £, part 

 of an inch depth for evaporation , which 

 is four times as much as fell at night. 



I found, by the fame means, the evapo- 

 ration of a winter's day to be nearly the 

 fame as in a fummer's day ; for the earth 

 being in winter more faturate with moi- 

 fture, that excefs of moifture anfwers to the 



I 



excefs of heat in fummer. 



Nic. Cruquius N° 381. of the Philofo- 

 phical Tranfaftions, found that 28 inches 

 depth evaporated in a whole year from \va- 



E 4 tcr, 



