ATMOSPHEROLOGY.; — B A.ROMETER. 



371 



confined to the spring and summer seasons, I can- 

 not give a precise account of the magnitude of 

 those changes. I shall, however, specify a few of 

 the most remarkable tliat have occurred within m.y 

 own observation. 



Year. 



Month, &c. 



1808, 



1809, 

 1812, 



1813, 



1814, 

 1815, 



1816, 

 1817, 



April 4. 

 May 12. 

 — - 6. 



Apri 



3. 



7. 

 13. 

 23. 

 24 

 13. 

 12. 

 27. 

 28. 

 29. 

 14. 

 13- 

 18. 

 20. 



Latitude. 



66°.59' 



77.40 

 73.49 

 75.23 

 75.35 

 66.30 

 73.11 

 80 07 

 80.10 

 71. 

 77.21 

 78.20 

 78.10 

 78. 

 72.54 

 68. 3 

 71.56 

 73.25 



Changes of the Ba- 

 ronneter. 



fell, 

 fell, 

 fell, 

 fell, 

 fell, 

 rose, 

 fell, 

 fell, 

 rose, 

 fell,' 

 rose, 

 fell. 



Inches. 



0.92 

 0.72 

 0.62 

 0.77 

 0.92 

 0.50 

 1.02 

 0.82 

 0.86 

 1.00 

 0.60 

 0.81 



rose, 0.67 

 rose, 0.80 



fell, 

 fell, 

 fell, 

 rose. 



0.53 

 0.73 

 1.12 

 1.01 



Interval. 



Hours 



24 

 24 

 24 

 12 

 24 

 12 

 12 

 24 

 24 

 24 

 14 

 24 

 12 

 20 

 16 

 24 

 21 



Tlie greatest height of the mercury I ever ob- 

 served during twelve Greenland voyages, was 30.57? 

 which occurred on the 3d of May 1815; and the 

 greatest depression 28.03, when near the ice in la- 

 titude 66^50', on the 5th of April 1808. Hence 



A a 2 



