1818.] 



On the Suspension of Clouds. 



103 



1812. 



May 



Sun, 



Barometer. 



Morning. Mid-day Evening. 



28 

 28 

 28 

 28 

 28 

 28 

 '23 

 28 

 '27 

 '27 



Son. 10 



11 



12 



13 



14 



15 



16 

 Sun. 17 



18 



19 



20 



21 



22 



23 

 Sun.24|28 



25 27 



26 28 

 27|28 

 2827 

 2928 

 3028 



Sn.3l|28 



'27 

 28 

 28 

 88 



27 

 -28 

 28 



'28 

 '28 

 -23 

 '28 

 '28 

 '28 



7-0 

 6-6 

 83 

 6'2 

 4-0 

 3 

 5 

 3 

 10 

 7 



10-3 

 05 

 1-6 

 00 

 108 

 5-8 

 6-7 

 65 

 55 

 7-3 

 5-7 

 4-8 

 3-6 

 1-5 

 11-5 

 06 

 01 

 99 

 0-5 

 04 



28 



28 



28 



28 



28 



28 



-28 



28 



-27 



27 



-27 



28 



28 



27 



-27 



28 



28 



-28 



'iS 



28 



'28 



-28 



-28 



^8 



Thermometer. 



Morning. Mid-diy. Evening 



02127 



7-3 

 6-2 

 8-3 

 4-8 

 3-5 

 3-8 

 5-3 

 28 

 9-2 

 8-1 

 11 

 21 

 1-3 

 11-8 

 11-5 

 6-2 

 56 

 6 



6-2 



6-7 



5-4 



5-2 



3-2 



10 



11-2 



0-9 



11-3 



9-6 



02 



0-6 



1 1-9 



28 

 2S 

 -28 

 '28 

 »8 



.'8 

 23 

 -28 

 87 



27 

 '27 

 '28 

 28 

 '27 

 '28 

 '28 

 '28 

 '28 

 '28 



7-4 

 6 

 7-0 

 4-5 

 2-8 

 4-2 

 4-7 

 0-7 

 7-8 

 8-4 

 114 

 2-8 

 0-7 

 11-5 

 2-8 

 7-5 

 4-8 

 4-8 

 6-8 

 61 

 5-2 

 3-9 

 2-8 

 0-6 

 10-4 

 1-1 

 10-2 

 10-2 

 11-9 

 0-8 

 11-9 



38 

 4-6 

 5-5 

 60 

 5-7 

 4-1 

 70 

 6-8 

 1-5 

 1-8 

 8-0 

 00 

 1-6 

 1-0 

 7-8 

 1 



8-0 

 6-5 

 8-0 

 4-2 

 1-0 

 2-5 

 8-0 

 5-6 

 0-0 

 ■ 28 

 0-5 

 0-0 

 7 

 3-8 

 3-4 



6-7 

 7-8 

 4-4 

 4-4 

 4-5 

 0-0 

 2-8 

 3-2 

 1-5 

 3-3 

 4-0 

 3-7 

 36 

 3-0 

 9-6 

 3-9 

 10 5 

 5-3 

 3-8 

 63 

 3-2 

 5-1 

 9-3 

 71 



- 1-4 



- 1-7 

 2-8 

 1-8 

 4-8 

 5-8 

 5-7 



Wind. 



Morn- 

 ing. 



10 



2-8 



68 



7-3 



8-0 



6-2 



98 



50 



0-5 



09 



02 



1-8 



1-4| 



1-5 



1-8 



0-4 



4-8 



10 



0-9 



1-2 



1-8 



10 



30 



• 1-0 



2-0 



- 36 



- 2-3 



- 2-3 

 1-6 

 1-0 

 1-2 



S 



w 



NW 

 NE 



NW 

 NE 

 Calm 



N 

 SE 



N 

 NW 



N 



N 

 Calm 

 NW 



N 



W 



N 

 NW 



S 



N 



Mid- 

 day. 



Even 

 iug. 



De- 

 grees 

 of 



Wind 



N 



Calm 



N 

 N 



NE 

 N 



W 



NW 



NE 

 NW 

 NE 

 NW 



W 

 SE 



N 

 NW 



W 



W 



Calm 

 W 

 N 

 W 

 N 

 NW 

 W 

 N 

 W 



w 



Calm 



N 

 N 



NE 

 N 



NW 

 NW 



Calm 



NE 

 NW 

 NE 

 JSW 



N 



E 



N 

 NW 

 Calm 



w 



NW 



N 

 SW 



N 



E 

 Calm 



N 

 Calm 



N 



Calm 



N 

 N 



Calm 



N 



A 



D 



C 



B 



B 



B 



A 



A 



B 



A 



B 



A 



A 



A 



D 



A 



D 



A 



I) 



A 



A 



A 



A 



A 

 B 

 A 

 A 

 A 

 A 

 A 



Observations. 



Partially clear. 



Ditto, ditto. 



Clear. 



Cloudy. 



Ditto. 



Much snow. 



Thick. 



Cloudy. 



Much snow. 



Ditto, ditto. 



Cloudy. 



Partially clear. 



Cloudy. 



Ditto. 



Snow. 



Cloudy. 



Partially clear. 



Ditto. 



Ditto. 



Ditto. 



Ditto. 



Ditto. 



Ditto. 



Snow, foggy. 



Ditto. 



Ditto. 



Ditto. 



Ditto. 



F"ggy. 



Ditto. 

 Ditto. 



{To be continued.) 



SIR, 



Article IV. 



On the Suspension of Clouds. 

 (To Dr. Thomson,) 



I iiAVK often in the course of my reading looked for an ex- 

 planation of the suspension of clouds; but if I may judge from 

 the very crude conjectures thrown out on this subject by the 

 best writers, no satisfactory solution has hitherto appeared. 



L>e Luc, if 1 recollect right, supposes the particles of vesicular 

 vapour constituting clouds, each to contain a portion o hydro- 

 gen eas, which enables them, like so many little air balloons, to 

 fupnort themselves in the atmosphere at a certain elevation. 



This hydrogen he conceives to be derived from a fancied 

 decomposition of a portion of the water itself ; but unfortunately 

 he neither gives any explanation of the cause, nor any proot ot 

 the effect ; though, had there been any foundation for hvs sur- 



