134 



MR ROBERT C. MOSSMAN ON THE METEOROLOGY OF 



As regards the Cape Horn region and Sandy Point, the above means differ but little 

 from those o-iven in Table II. At the Falkland Islands, however, the differences are 

 considerable, amounting on the mean of the year to an excess of 0*067 inch during the 

 short period, while in July, August, November, and December the excess amounts to 

 more than a tenth of an inch. At all three stations it will be observed the highest 

 mean monthly pressure occurs in September. The month of minimum pressure, on the 

 other hand, is December at Sandy Point, January and March for the Cape Horn area, 

 and March at the Falklands. The range in the mean monthly pressures is 0*204 inch at 

 Sandy Point, 0*194 inch in the vicinity of Cape Horn, and 0*170 inch at the Falkland 

 Islands, being greatest in the region most removed from the direct influence of the 

 ocean, and least at the strictly insular station on the Falklands. It is of interest to 

 give for the Cape Horn area the difference of mean monthly pressure for the five years 

 1903-1907, as compared with the above long average, the plus sign indicating that 

 pressure during these five years was in excess, and the minus sign that it was in 

 defect, of the long average. 



July. Aug. Sept. Oct. Nov. Dec. Year. 



in. in. in. in. in. in. in. 



+ •084 --012 --114 +-007 -'015 +-014 -"001 



Thus during the past five years pressure in the Cape Horn region has on the mean 

 of the year been virtually the average, but with considerable variations in the months, 

 ranging from an excess of + "084 inch in July to a defect of — 0*114 inch in September. 



The following table showing the highest and lowest mean monthly pressures in the 

 vicinity of Cape Horn may be of interest, owing to the comparatively (for the region) 

 long period covered by the combined records. 



Jan. 



Feb. 



March. 



April. 



May. 



June. 



in. 



in. 



in. 



in. 



in. 



in. 



+ •058 



+ ■066 



-•080 



+ -040 



+ ■032 



-•098 



Capb Horn Region Latitude 54° 30' S., Longitude 65° W. Highest and Lowest Mban 

 Monthly Pressure at 32° Sea-Level and Standard Gravity. 









Highest. 



Lowest. 



Range. 





Inches. 





Inches. 





Inches. 



January 

 February 

 March . 

 April 

 May 

 June . 

 July . 

 August 

 September 

 October 

 November 

 December 

 'Year . 







29-752 

 •610 

 •840 

 •811 

 •737 

 •816 

 •723 

 •897 

 •890 

 •876 

 •759 

 •722 



29-646 



1878 

 1896 

 1878 

 1878 

 1904 

 1888 

 1887 

 1907 

 1886 

 1876 

 1876 

 1904 

 1878 



29-236 

 170 

 •185 

 •310 

 •284 

 •285 

 •287 

 •342 

 •353 

 •256 

 T22 

 •210 



29412 



1890 

 1891 

 1895 

 1892 

 1907 

 1905 

 1889 

 1905 

 1889 

 1892 

 1896 

 1889 

 1889 



0-516 

 0-440 

 0-655 

 0-501 

 0-453 

 0-531 

 0-436 

 0-555 

 0537 

 620 

 0-637 

 0-512 

 0-234 



* The years with complete observations are 1876, 1878, 1888-1893, 1896, 1903-1907. 



