Remarkable Weather. 431 



1852 . . 



greatest 



cold, 39-7 



1853 . . 



)> 



„ 37-2 



1855 . . 



>) 



„ 39-8 



1856 . . 



)) 



„ 39-1 



1857 . . 



>) 



„ 40-0 



1858 . . 



)> 



„ 39-5 



1860 . . 



)) 



■„ 39-5 



1862 . . 



' a 



» 39-7 



1864 . . 



)> 



„ 30-5 



So tliat the temperature on the 1st of June, 1864 was 4° - 6 

 lower than had been recorded before in June since 1797, and 

 there is no year nearly so. low, even if we go back to 1785; 

 whilst, if we take Mr. Morley's reading of 27 J *5, which is quite 

 correct (made by an excellent thermometer of Messrs. Negretti 

 and Zambra, compared by my Kew standard), we have 7°*6 

 below any other reading, and 8 0, 7 below the lowest reading in 

 London. 



* In conclusion, a few words on the weather of May will 

 have its bearings on the subject. 



The movement of the wind from the 1st to the 21st was — 



o o 



From 1st to 5th, direct, 1260 ; retrograde, 1012 



„ 6th to 10, „ 635; „ 472 



„ 11th to 15, „ 1720; „ 1384 



„ 16th to 20, „ 3275; „ 2407 



The direct exceeding the retrograde movement by 1611°, or by 

 A<\ complete revolutions. The greatest changes occurring on 

 the 15th; direct, 956', retrograde 888°; on the 18th, direct 

 990°, retrograde 922°, and on the 20th, direct 1440°, retro- 

 grade 675. 



On the 19th, a few minutes before the time of greatest 

 heat, viz., 2*30 p.m., the therm ometrical and hygrometrical 

 conditions of the air were — ■ 



Temperature in shade .... 89*0 

 Wet bulb thermometer . . . . 67"9 

 Temperature of the dew point . 53*1 



Elastic force of vapour, 0*404 of an inch. 



Weight of vapour in a cubic foot of air, 4*2 grains. 



Additional weight of vapour required to saturate a cubic 

 foot of air, 10*2 grains. 



Degree of humidity (100 = saturation) 29. 



Weight of a cubic foot of air, 508*8 grains. 



Weight of the barometer reduced to the sea-level, 30*204 

 inches. 



Pressure of the gases of the air, 29*800 inches. 



