160 Mr. Howard's Meteorological Journal. [August, 181S. 



stratus, and a few drops, evening. 2, 3. Exhibitions of (he lighter modifications 

 variously interchanging and mingling, succeeded by Cumulostratus. 4. Windy 

 morning, and overcast with Cumulostratus: a fine day: tvvilig.it coloured, with 

 diverging shadows. 5. Very fine day: Cirrocumulus above Cumu'us prouucing 

 beautiful clouds by inosculation. 6. At three this morning, in the NE, a most 

 extensive orange twilight, in the form of a pyramid, resting on a base of low 

 purple haze, occasioned by dew in that quarter. A fine day ensued, with a 

 bre< ze, and Cumuli casiing shadows in a somewhat hazy air. 7. The shadows 

 radiating do« nward from clouds continue, perhaps occasioned by fine dust float- 

 ing. I observed, in passing Houn--low Heath, two whirlwinds, earring tb»" dust 

 in anarrow, perpendicular vortex to a great heightin the air, from whence il per- 

 ceptibly showered down again. S. Cumulostratus, after a clear morning: strong 

 breeze and much cloud, with a few drops. 9. Clear morning, with Cumulus, 

 Cirrus, and a breeze. About seven, p. m., setting out to return 'roiii London, I 

 jaw, in theNW, a remarkably large Cirrus, composed mostly of straignt, diverg- 

 ing fibres, extended towards the S\V ; and which, when I' got home, had passed to 

 Cirrostratus. In this cloud (as it appears) my family at the sam-* time observed a 

 coloured solar halo with two rather indistinct parhelia, the whole of which had 

 escaped my notice in coming out of town. They described the hao as >o large 

 that a considerable portion of the circle, if continued, would have been below the 

 horizon; and the parhelia as situated, the one directly above the sun (which was 

 somewh it obscured), the other to the N of it, and both in the circle : the parhelion 

 to the S (if there were one) was behind some houses ; and the whole appe .ranee 

 had considerably gone off" before they could get to view this side of it. T if phe- 

 nomena wire witnessed by several other persons; anl the halo, I find, was seen 

 likewise at Hertford. 10. A few large drops between six and sev< n, a.m.: 

 close Cumulostratus prevailed afterwards. 11. Large Cirri, passing to the form of 

 the Nimbus, mingled with Cirrocumulus and Cirroslrutus. In the ev. ningan exten- 

 sive obscurity in the W and SW, fronted by dense Cirrostrati : a fresh, turfy smell 

 came with the wind, and at length, at half-past 10, it began to rain steadily with 

 us. 12. Wet morning : fine day afterwards. 13, 14. F.ne, with Cumuli, &c. 

 dew, and orange twilight. 15. A Stratus last night: thunder-clouds abnut : the 

 moon bright gold colour, crosr-ed by fine streaks of Cirrostratus. 16. The moon 

 paler amidst hazy Cirrus and Cirrostratus, &c. in SE. 17. Cloudy morning: light 

 shower, then fine with Cirrus and Cirrocumulus. IS. Thunder cloud-, p. m. : 

 Nimbi, &c. grouped in the N. 19. Wind, SE; thundcrcame within hearii.g to the 

 JiW, p.m.: temp. 85°: hygrometer, 30°: not a drop of rain here, and wind NW 

 after it. 20. Thunder groups, and rain visible to northward : fair with us: clouds 

 red at sun-set. 21. Wind W, a.m. Cirrocumulus, chiefly in strips from N to S ; 

 then Cumulostratus, &c. A very variously compounded and coloured sky during 

 twilight. 22. Fleecy Cumuli, &c. a. m. 23. Serene, with Cirrus, and fine breeze. 

 24. Cirrus and Cirri cumulus proceeding to electrical formations: strong bieeze 

 and slight sslar halo : p. m. after the maximum of temp, was over, Nimbi, with 

 thunder and lightning, approached from the south. The clouds at sun-set showed 

 very rich crimson lake and orange tints; and we had showers, with ahollow wind, 

 and lightning, till past midnight. 



RESULTS. 



Winds light and Variable. 



Barometer: Greatest height 3032 inches. 



Least 29-67 



Mean of the period 30037 



Thermometer; Greatest height 93° 



Least , 44 



Mean of the period (at the Laboratory) 67*24 



Mean of the Hvgrometer 47° 



Evaporation 4*60 inches. 



Rain 0*63 



A period unequalled in warmth since the jear 1808, when the seventh month 

 averaged 67 - 19°, and the thermometer at Plaistow rose to 96°. The eighth month, 

 J802 (averaging 67 '56°;, is the only one that has exceeded the present in heat for 

 20 years past. 



Tottenham, Seventh Month, 25, 1818. L. HOWARD. 



