614 MR ALEX. BUCHAN ON THE MEAN PRESSURE OF THE ATMOSPHERE 



TABLE I. — Showing the Mean Monthly and Annual Height 



Places. 



Country. 



Autho- 

 rities, 

 see page 

 635. 



Numbei 



of 

 Years. 



Years 



Specified. 



Hours of 

 Observa- 

 tion. 



Latitude. 



Longitude. 



Height 



in Eng. 



Feet. 















O 1 



/ 





Valparaiso, . 



Chili 



67 



£ 



1853 



"iT : 3^- 



-33 25 



-71 40 







Port Famine, 



Patagonia 



4 



3 



4 





? 



-53 38 



-70 52 



? 



Port Louis, . 



E. Falkland Isl. 



104 



T 

 1 2 



1842 



? 



-51 40 



-59 







St Michael (at 32= ?), . 



Azores 



27 



10 



1840-49 



? 



37 35 



-25 30 



? 



Ponta Delgada, . 



do. 



94 



1 



1868-69 



hourly 



37 40 



-25 32 



? 



Funchal, 



Madeira 



95 



■•{ 



1826, 

 1852 3 



10: lOor 

 7: 2, 7 



i 32 38 



-16 56 



95 



Orotava, 



Canaries 

 North Atlantic 



do. 

 do. 

 do. 



67 

 96 



96 

 96 



96 



i 



1856-57 



about 9: 



28 27 

 40to35 



35to30 

 30to25 

 25 to 20 



-16 38 



70 

 





 

 





do. 



96 









20tol5 



o 









do. 



96 









lotolO 











do. 



96 









lOto 5 



'So 









do. 



96 









-5to 



a 



o 









South Atlantic 



96 









-Oto 5 











do. 



96 









-5tol0 



£ 









do. 



96 









-10tol5 



a) 









do. 



96 









- 15to20 



13 









do. 



96 









-20to25 



o 









do. 



96 









-25to30 



o 









do. 



96 









-30to35 



*3 



o 









do. 



96 









-35to40 



fr 









do. 



96 









-40 to 45 











do. 



96 









-45 to 50 











do. 



96 









-50to55 











do. 



96 









-55to60 









Ascension, . 



do. 



67 



2 



1854-55 



9£: 3£ 



-8 8 



- 14 28 







St Helena, . 



do. 



44 



5 



1854-5;) 



do. 



- 15 55 



-5 42 



40 



Do., 



do. 



97 



q 7 

 °T2 



1844-47 



biho. 



-15 55 



-5 43 



170.3 



ADDENDUM. 



The Atmospheric Pressure of the Atlantic Ocean.— The following Pressures are 

 the means of observations made in July and August by Captain Toynbee, during five 

 voyages to India, at different points on the Outward Route :— 



Inches. 

 35° N. Lat. 30-252 

 30° „ 30-166 



25° „ 30-092 



20° „ 30-022 



15° „ 29-996 



Inches. 



10° N. Lat. 30017 



5° „ 30025 



Eqi-atnr 30-042 



5° S. Lat. 30-050 



Inches. 

 10° S. Lat. 30-0S2 

 15° „ 30-142 

 20° „ 30-24 5 

 25° „ 30-236 



The results were published in the " Proceedings of the Royal Society," June 15, 

 1865, but not corrected for temperature* The figures given above Captain Toynbee 

 has kindly corrected for temperature and height. 



* The uncorrected means were used in constructing the charts exhibited in reading Part I. of this 



paper. 



