made at Fort Franklin in 1825, 1826, and 1827. 249 



TABLE IV. 



Of the Mean hourly excess shewn by a Black-bulb Mercurial Ther- 

 mometer sheltered by Glass over a clean Thermometer in the Shade, 

 for the twenty -eight last days of May 1826 (from fourth to thirty - 

 first day inclusive^. 



An observation made at 5 a.m. from the 4th to the 17th inclusive, 

 yields a mean excess of the black-bulb of 6.29°, and a maximum of 22.5° ; 

 and one at 4 a.m. from the 18th to the end of the month, a mean for the 14 

 days of 6.36°, and a maximum of 22'. The mean temperature for the whole 

 28 days at 4 a.m. was +32.35°, and at 5 h., +33.51° F. 



TABLE V. 



Containing similar Observations for 21 last days of July 1826. 



The observations for July and August were made by Mr Dense at inter- 

 vals of 3 hours, but as he had no watch to regulate his time, the hours could 

 not be very accurately kept, lie was accustomed to judge of the time of 

 day by the position of the sun, and a meridian line was traced, by which he 

 could ascertain noon. 



