252 Mr. Dalton on Meteorohgt/. [Aphii, 



springs in this place is usually between 48° and 50° ; probably, 

 the mean annual temperature may be nearly 49°. The general 

 annual mean, as determined by my thermometer, is between 47** 

 and 48°. The monthly means for July I have had usually to 

 borrow from Mr. Hanson's observations, or from those of others 

 at some distance, as for the barometer. 



III. Of Rain. 



In the 5th volume of the Memoirs, Part II, published in 1802, 

 I have given an account of the depth of rain which fell in 

 Manchester during the eight preceding years, with the average 

 monthly and annual means. ^Having now a further series of 

 observations for 17 successive ye-ars, it may be proper to give a 

 detail of these last, and to incorporate them with the former so 

 as to obtain a general average for the whole period of 25 years. 



The rain-guage has been all the time situate in a garden on 

 the S.E. side of Manchester ; it is 20 yards distant from any 

 house or elevated object that can influence the fall of the rain. 

 The gauge is a funnel of lU inches diameter, and the top is 

 surrounded by a perpendicular rim of three inches high to pre- 

 vent any loss by the spray ; it is fixed in a proper frame with a 

 bottle lor tlie v/ater, and it stands above two feet above ground. 



