at Leith Fort every Hour of the Day in 1824 and 1825. 373 



TABLE, shewing the Mean Temperature of each Hour for Six Summer Months, 

 from April to September inclusive, and for Six Winter Months from October to 

 March inclusive. 



Hours. 

 1 A.M. 

 2 



3 



4 



5 



6 



7 



8 



9 

 10 

 11 

 12 



1 P.M. 



2 



3 



4 



5 



6 



7 



8 



9 

 10 

 11 

 12 



Mean, 54.59 



40.63 



By means of this Table I have projected the summer and 

 winter curves, as in Plate XVIII. These curves are beautifully 

 regular, and may be regarded as an accurate type of the daily 

 progression of temperature in summer and winter, each point of 

 each curve being the mean of about 180 observations. 



