WHOLE VOL. NOTES. EUROPE 25 



January 1809 printed 36^3, correct value 30?3, the mean 

 temperature of that year changing from 46°? to 46?2 in 

 consequence. 

 Rainfall. 



The rainfall totals for the years 1770 to 1776, 1780 to June 1781, 

 and 1785 to 1900 were taken from the above-mentioned 

 work. The Charlotte Square record was used from 1851 

 until the end of 1923, when the observations ceased. From 

 January 1924 the Royal Observatory register was employed. 

 A comparison of the Royal Observatory and Charlotte 

 Square rainfalls for the 25 years 1896 to 1920, common to 

 both series, gave the following mean monthly and annual 

 values in inches : 



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

 1.86 1.91 2.43 3.05 1.86 2.80 2.29 2.28 25.44 



1.53 2.05 1.87 2.53 3.07 1.91 2:74 2.20 2.38 25.72 



Hence on the mean of the year, the Blackford Hill rainfall 

 was i percent less than that recorded at Charlotte Square, 

 the extreme differences observed, being an excess of 7 per- 

 cent in January and a deficiency of 9 percent in May. As 

 regards the other months of the year, the differences were 

 small and in several months, negligible. In calculating the 

 general means, the rainfalls from January to June 1781 

 were not included. 



GIBRALTAR 



Authority. 



Manuscript returns supplied by the Public Works Department 

 and filed in the Meteorological Office, London. 

 Site. 



1921-1929, May 29. An obsolete bastion of the fortifications on 

 the sea front on the SW. side of the Rock and 

 50 ft. above Mean Sea Level. 

 1929, May 30-1930. Alameda Gardens, 1300 ft. to the SSE. of 

 the former site and farther from the sea. 

 Pressure. 



Site: The height of the barometer cistern above Mean Sea Level 

 was: 



1921-1929, May 29 53 ft. 



1929, May 30-1930 90 ft. 



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