1820.] and the Planet Venus. 413 



occasionally touch upon the pressure and humidity of the atmo- 

 sphere, and attend to such other circumstances as came under 

 our observation relative to the effects produced on the weather 

 Sec. before, particularly during the eclipse, and after: 



Mean time. Therm. 



Sh 30'" — 52° At sun-rise the ciirus clouds were very red, and 

 interspersed about the sky in tufts. Thermo- 

 meter 2° above the minimum for the night. 

 Barometer, 30* 10 inches, and an easterly wind. 



■6 — 53 A dense stratus overspread a great extent of the 

 neighbouring fields and water. 



7 — 554- Cirrus with a slow motion from the W. while 



the wind came from the E. which indicated 

 opposite currents. 



8 — 59 Extensive beds of cirrostratus followed the last 



modification of cloud, and nascent cumuli 

 appeared to the eastward. 



9 — 62 The sky appeared of an azure hue, and the 



clouds dispersed. 



10 30 — 64 Lofty cirri transformed into beds of cirrocumu- 



lus ; and the wind veered round from E. to 

 S.E. by S. 



11 — 66 The last modification was composed of beds of 



small round lofty well-connected clouds in an 

 azure sky, and passed slowly to the eastward. 

 De Luc's hygrometer at 50°, being the driest 

 state of the atmosphere for the day. 



12 — 69 Attenuated cirrostratus beneath cirrocumulus 



screened the sun's disc, it was impelled east- 

 ward by the force of an upper current ; the 

 lower current from S.S.E. thus following the 

 sun. Barometer, 30' 14 inches; and hygro- 

 meter, 51°. 



12 10 — 69-^ Attentive at the telescope, the sun being 

 scarcely perceptible for clouds, which in- 

 creased our anxiety to observe the beginning 

 of the eclipse. 



12 14 — 70 The sun's disc now got visible in the attenuated 

 parts of the passing clouds ; and the thermo 

 meter at its maximum height for the day. 



12 16-i- — 70 A clearish space presented itself, and the lower 

 limb of the moon had just come in contact 

 with the sun's upper limb. This we consi- 

 dered the beginning of the eclipse. 



12 20 — 69^ The moon'.s limb advanced slowly over the sun, 

 with a well-defined edge. 



12 25 — 69^ The clouds passed off to the eastward, and only 

 a cirrocumulus was left under the sun. With 



