It appears from observation, that the quantity of rain, as shewn by 

 two gages, is not materially influenced by the height of the places above 

 the level of the sea, provided the heights of the gages above the ground 

 are equal ; but it is a singular fact, which has not been satisfactorily ac- 

 counted for, that it is very considerably affected by the height of the 

 gages above the surface of the earth, though all other circumstances are 

 the same. This will appear by a comparison of the following results, 

 given in the Philosophical Transactions. 



Quantity of rain observed by Mr Daines Barrington, for upwards of 

 four months in 1770, as shewn by two gages, the one placed upon Mount 

 Rennig, in Wales, the other on the plain below at about half a mile dis- 

 tant ; the perpendicular height of the mountain being 1350 feet, and each 

 gage being at the same height above the surface of the ground. 



INCHES. 



Bottom of mountain ********************** 8.766 

 Top of mountain *************************** 8.165 



Quantity Of rain observed by Dr Heberden, from July 7, 1766, to July 

 7, 1767, as shewn by three gages, one placed below the top of a house, a 

 second upon, the top of a house, and the third upofl Westminster Abbey, 

 223 



