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DISCUSSION < » F T HE II RIZONTAL COMPOSE S T 



The value- for 1843 within brackets are interpolated by means of the continued 

 readings at 14" 21| m ; at this hour the difference of reading from the preceding 

 year is 259, which added to the values of 1842 gave resulting normals for 1843; in 

 the same manner the reading in 1843 at 1 4 1 ' 21| m when compared with the reading 

 in the following year (1844) leaves the difference 185, which quantity when sub- 

 tracted from each hourly value in 11S44 gives a second determination for the year 

 1843; the mean of the two determinations for each hour lias 1 n inserted above. 



