398 Meteorological Observations for September 1827. 



in several parts between Aquila and Delphiniis, similar to the bursting of a 

 charged bomb. Its motion was comparatively slow, perhaps from its great 

 altitude, as it was about five seconds of time in moving through a space of 

 56 degrees. Its light was so strong as to be distinguished on the ground 

 from that of the moon, whose age was between ten and eleven days. 



On the morning of the 11th a parhelion appeared at 8 o'clock on the 

 eastern side of, and 22° 48' distant from, the sun's centre, just without the 

 edge of a faint solar halo ; there were several modifications of clouds about 

 at that time, and the cirrocumuli in round flocks ultimately changed from 

 a silvery colour to a black electrical appearance ; and the first of the 

 equinoctial gales followed after sunset. 



On the 12th, 16th, 18ih, 2.3rd, 25th, and 30th, solar lights and shades 

 were very conspicuous ; they were sometimes produced by reflecting in 

 diverging forms from the surfaces of dense cumulostratus clouds, at other 

 times by passing through their apertures and most attenuated parts; but 

 immediately after these clouds had passed the sun's disc, the lights and 

 shades disappeared. 



From these appearances, together with those last month, both solar lights 

 and shades are evidently produced by the rays passing through the openings 

 in the clouds, and also by reflection upwards or downwards, according to 

 their position, from their dense surfaces, which bar the passage of the di- 

 rect rays : they maybe also produced by dense lofty imperceptible vapours, 

 and perhaps by thick clouds of dust at a considerable height from the 

 ground. 



The atmospheric and meteoric phcBtioinena that have come within our 

 observations this month, are one parhelion, one solar, and one lunar halo, 

 twenty meteors, one aurora boreahs on the 25th, four rainbows, lightning 

 on the 6th and on the 28th, with passing thunder-showers on the latter 

 day; and five gales of wind, or days on which they have prevailed, namely, 

 one from N., one from S.E., and three from the S.W. 



REMARKS. 



London. — Sept. 1. Cloudy and fine. 2 — 8. Fine. 9. Cloudy: rain 

 began at 7 p.m. 10. Showery. 11, Cloudy. 12. Rainy. 13. Showery. 

 14— 17. Fine. 18. Rainy evening. 19. Fine. 20. Cloudy. 21,22. Fine. 

 23, 24. Showery. 25. Fine. 26. Morning fine, wet evening. 27, 28. Fine. 

 29.-Rainy. 30. Fine. 



Penxawe.— Sept. 1. Fair. 2 — 4. Clear. 5, 6. Fair. 7. Clear. 8. Fair. 

 9 — 11. Rain. 12. Clear: showers. 13. Clear. 14 — 18. Fair. 19. Fair: 

 misty. 20. Fair. 21. Rain. 22,23. Clear: showers. 24. Showers. 

 25. Rain. 2G. Fair: showers. At about 9 p.m. there was a luminous ap- 

 pearance in the north-east, which soon afterward proved to be a brilliant 

 aurora borealis. 27. Fair. 28, 29. Fair: showers, 30. Fair. — Rain gu age 

 ground level. 



Boston. — Sept. 1, 2. Fine. 3 — 9. Cloudy. 10. Cloudy: rain, p.m. 

 11. Fine: rain, P.M. 12. Fine, 13. Fine: rain, a.m. 14. Cloudy. 15.Fine. 

 1 6, 1 7. Cloudy. 18. Cloudy: rain, P.M. 19. Fine. 20. Cloudy: rain, a.m. 

 21. Cloudy. 22, Fine : rain, A.M. 23 — 25. Fine. 26. Fine : rain, p.m. 

 with rainbow. 27. Fine. 28. Foggy. 29. Fine : rain, a.m. 30, Fine, 



RESULTS, 



Winds, NE. 9 : E. 1 : SE. 4 : S. 6 : SW. 8 : NW. 2, 



London. — Barometer: Mean height for the month 30*13inch, 



Thermometer : Mean height for the month 59*05° 



Evaporation 2*40 inch. 



Rain 3-26, 



Meteoro- 



