COMPARATIVE TABLE OF TEMPERATURES. 251 



X. 



Mackenzie ; est Greenland ; and on the Yukon. 



No. 5. is compiled from Sir George Back's observations in 1834, 

 (fifteen daily.) 



No. 6. is abstracted from a register kept at Fort Enterprise in 

 1820, 1821, and 1822. The summer observations are defective; but 

 the mean summer heats are inferred from observations made in travel- 

 ling over the barren grounds further north. 



No. 7. Two years' observations at Fort Franklin ; first year nine- 

 teen observations daily, except in svimmer, during which, and in the 

 second year, six observations daily at equal intervals. 



No. 8. Fifteen to seventeen observations, daily. 



No. 9. Observations at six and six in summer ; and in winter as 

 early as the thermometer could be read in the morning, and as late 

 in the evening. Dove's correction for these hours at Toronto has 

 been applied. 



