240 Mr. Howard's Meteorological Journal. [Sept. 1818. 



REMARKS. 



Eighth Month. — i. With the exception of a gentle rain in the evening of seventh 

 Month, ii, the steady, fine weather has continued. Much Cirrocumulus of late. 

 This Jay, in itaveiling, 1 observed the clouds, both at sun-rise and sun-set, beau- 

 tifully coloured with a double gradation of tints, in which the respective effects of 

 the direct and r. traded rays were very distinctly marked. 6. Wind in the morn- 

 ing. SE, bri.^k, with Cirrostratus and Cirrocumu w; the latter formed in one instance 

 on; of Cirrus with unusual rapidity : the wind veered gradually from SE by SW 

 to NK: at unie, p. m. a strong breeze blowing, with an appearance of rain to N\V, 

 it began to lighten : at first, a very faint blue ll.ish ; then others, gradually increas- 

 ing in intensity at intervals of about a minute, filling the air, without being refer- 

 able to any point of the compass, followed generally by a sudden puff of wind, 

 and without thunder. In 20 minutes, however, thunder began to be heard in the 

 Wand NW, .ind a storm passed in view to the NE. the flashes broad and vivid on 

 the whole North horizon, and crossed by delicate stria? of a different colour. We 

 h,.il onl\ a f^w drops, ami it was over in two hours. 7. The suu-set was more richly 

 coloured with yellow (passing at length through orange to lake and purple) than I 

 remember ever to have Men it in this tint before. Ii literally glowed like a bright 

 flame on the lower surface of some dense Cirri, parsing to Cirrocumulus; which 

 modification was well marked afterwards. 9. A fine coloured sun-set again, but 

 in deep orange passing to red, and succeeded by Cirrostratus. 10. Cloudy, with 

 a brisk wind most of the day: Cirrostratus and dew. 11 — 13. Fine breeze, 

 vaiyiug to N and E: much dew; twilight, orange; and the moon pale. 

 1 % — 22. Pretty strons breezes prevailed during this interval : the sky presented 

 nsuall. the Cumulus passing to Cumulostratus ; but at intervals this modification 

 took its character from Cir, ocumulus, which entered into its composition front 

 above. There was scarcely any Cirrus or obscurity above the clouds, but rather 

 a cold, transparent blue : two or three limes the density of the clouds promised 

 showers, but ii always ended in a very slight sprinkling. Coloured skies at sun- 

 set were frequent; as also the appearance of diverging bars of light and shade, 

 ■which I ascertained in several instances to be due to the finmense quantity of dust 

 constantly floating in the air. 22. This morning, being gray with Cirrocumulus 

 and very cool, seemed like the commencement of autumn; and the warmth of a 

 fire was acceptable in a uorth room in the evening. 



RESULTS. 



Winds Southerly in the fore part; Northerly, with depression of temperature, i« 

 the latter part of the period. 



Barometer: Greatest height 30*27 inches. 



Least 29-80 



Mean of the period 30*051 



Thermometer: Greatest height 93° 



Least 43 



Mean of the period , 63*32 



Mean of the Hygrometer 45 



Evaporation, nearly.. . 4 inches. 



Rain : 0*14inches. 



A period unequalled in dryness since the beginning of 1810; when, withafrosty 

 air, under a similar course of winds, and the barometer averaging 30*07 in. there 

 fell in 3'idavs only 12 in. of rain. 



Tottehham, Eighth Month, 26, 1818. L. HOWARD. 



