inmie at Clapton. 247 



the sky became quite obscuced, and rain came on at 

 night. W. 



March 8. — Flimsy cirrus above mounta'nous cumuli, then 

 cumulostratus, and showers of hail and rain ; but clear night. 

 N.N.W. 



March 9. — Quite clear in the morning; afterwards cu- 

 muli increased, and the sky was nearly obscured; a shower 

 came on about three; after which it cleared, when I ob- 

 served cumulostrati with cirrostratus above : night fair, N. 

 and N.W. 



March 10. — Overcast morning; fair day, with heavy cu- 

 muli, &c. N.N.W. 



March 11. — Sunshine early: overcast day, but dry and 

 pleasant; the kind of cloud seemed to be large folded cu- 

 muli, approaching to cumulostratus. N. and N.W. 



March 12. — Loose cirrus and cirrocumulus above cumuli, 

 and much haze ; afterwards quite overcast. 



March 13. — Clear morning; aftei wards diurnal cumuli 

 arose, and flimsy light clouds were deposited aloft, followed 

 by cumulostratus and hail showers, with a brisk north wind. 



March 14. — Cirrus and others; showers in the afternoon. 

 N.W. 



March 15. — Clear morning; afterwards abundance of 

 cumulostratus, with some showers of snow and hail. Very 

 clear at night. N. 



March 16. — Cold cloudy day, and N.E. wind. 



March 17. — Cold raw day: sky chiefly clouded; some 

 snow kept falling frequently. N.E. 



March 18. — Fair morning; some cumuli and cirrostrati 

 appeared; afterwards it became a dark cloudy night. W. 



March 19.— Much cumulostratus, &c. By night I ob- 

 . served a corona about the moon. S. and S.E. 



March 20. — Snow, sleet and rain in the morning ; small 

 rain continued falling the greatest part of the day. 



In addition to the observations on Mons. De Luc's 

 Aerial electroscope, which I communicated in your Maga- 

 zine for June and July last, I have to add, that subsequent 

 observations on this instrument have convinced me, that 

 a certain degree of moisture is necessary to its action ; but 

 that peculiarities in the state of the atmosphere vary its 

 kind of action ; as, for instance, the regularity or irregu- 

 larity, strength or weakness, of the pulsation of the bells, 

 &c. Sometimes it will not act at all. Neither will the ad- 

 dition of moisture ever cause its irregular pulsation to be- 

 come regular. 

 Clapton, March 20, 1812. Thomas Forster. 



METEORO- 



