at Leith Fort every Hour of the Day in 1824 and 1825. 377 



TABLE, shewing the Hours of the Morning and Evening when the Mean Monthly 



Temperature occurs. 



The following are the results for the six winter months, from 

 October to March inclusive, and for the six summer months, 

 from April to September inclusive : 



Six Summer months, 

 Six Winter months, 



III. On the relation between the Mean Temperature of the 24 Hours 

 and that of any single Hour, or any similar Pair of Hours, 



' 



It was long the practice of meteorologists to observe the ther- 

 mometer three times a-day, on the supposition that the mean of 

 these three observations gave the mean temperature of the 24 

 hours. Observations of this kind are still continued in many 



3 B2 



