1819.] Days of Rain, Snoic, and Drizzle, at Viviers. 115 



determinate space of ground, we must place the rain guuge in a 

 situation completely exposed ; but if we wish to examine the 

 phenomena of rain, and determine its intensity, as the incli- 

 nation of the rain in consequence of the wind is accidental, 

 we must place the rain guage so that its mouth shall be 

 perpendicular to the direction of the rain ; but as it is not possible 

 to place it so, the inclination of the rain varying continually, we 

 must contrive matters so that the rain shall fall into the guage 

 in as perpendicular a direction as possible. For this purpose, it 

 is convenient to place the gauge in a spacious place surrounded 

 with high buildings, which, preventing the rain from being acted 

 on by the wind, allow it to assume nearly its primitive vertical 

 direction. It appears to me that it is very proper to employ at 

 once these two methods, which are capable of furnishing interest- 

 ing comparisons. I have, therefore, placed near my observatory 

 in a place quite open, a rain guage perfectly equal, and similar 

 to that which is placed in the court of my house, and 1 have 

 begun to register the quantity of rain which is collected by each 

 of these instruments. 



Annual Quantity of Rain and rainy Days at Viviers during 40 



Years. 



h2 



