398 Meteorology. 



Meteorological Olservations made at Clapton, in Hackney, 

 from Jpril 21 to May 15, 1815. 



April 21. — The clouded sky thickened, the wind eastward, and 

 rain began by falling in drops, and increased through the day; 

 at night it fell copiously. The Thermometer at 9 P.M. 40". 

 The Barometer 28-90: 'it fell afterwards to 28-85°. The tem- 

 perature contiimed about 40" all night, with wind and rain. 



April 22. — Cool and rainy. 



April 23. — The wind remained north-east, with smart April 

 showers of rain and hail. 



April 24. — Fair, and showers at intervals. Thermometer at 

 11 P.M. 39. 



April 25 . — Fine morning ; streaks of cirrus, aimuli lower down 

 in the atmosphere. It clouded in the evening, and rain came 

 on again at night. Thermometer at 11 o'clock at night 41°. 

 Barometer 29*70. Northerly wind. 



April 26. — Fair day : the clouds were copious in the morning; 

 but the day became clear and pleasant, with cumuli and light 

 bands of cirrus above them. In the evening cirrocumulative cir- 

 rostralus in Httle flimsy ^^occz^Z/. Thermometer in day abpve 60^. 

 At II P.M. 37°. Barometer 30-21. Bright starlight. 



April 27.— Northerly wind, and overcast with uniform thick 

 cloud, and a hazy atmosphere below. Starlight between clouds 

 by night. At midnight, Thermometer 46°. Barometer 30- 13. 



April 28. — Clouds, and warmer ; drops of rain ; fine evening. 



April 29. — Much cuvtulostratus with nimbi occasionally from 

 N. in the morning ; fair evening, with mixed clouds and occa- 

 sional light showers. 



April 30. — Long gentle showers and fair intervals A.M. 



May 1. — The weather became warm. This morning light 

 breezes from south-east with cirrus scattered above, and ephe- 

 meral cumuli below, marked a change in the constitution of the 

 air. Towards evening the denser sheets of cirrnstralus appeared, 

 but the night was fair and warm, with a gentle breeze. Ther- 

 mometer 11 P.M. 93. Barometer falling, 29-81. 



May 2. — Warm fair day, with rocklike c2imulosf.ratus, &c. 

 Towards evening nimbus and a slight imbrification and lightning. 

 Starlight night. Thermometer at midnight 49°. Barometer 

 29-88. Wind calm. 



May 3. — Calm warm day; much cloudiness in the morning. 

 When it cleared, there were large rocklike cumuli forming into 

 cumulostrati by coalition with upper masses of flattish clouds ; 

 iiimbiform haze in other places. Fine clear night. Thermo- 

 meter 1 1 P.M. 44°. Barometer 29' 84. N. 



May 



