Meteorological Observations. ISST 



most valuable papers in the order of merit, that shall be communi- 

 cated and read to the Society prior to the 31st of December 1850, 

 on Theoretical or Descriptive Geology, or the application thereto of 

 any of the kindred sciences. Competition to be free to all persons, 

 except to Members of the Council of the Society. The Society does 

 not bind itself to the publication of any papers presented for such 

 competition, nor to award any prize, unless papers of adequate merit 

 be presented. 



METEOROLOGICAL OBSERVATIONS FOR DEC. 1849. 



Chiswick. — December 1. Very fine. 2. Heavy rain throughout. 3. Rain. 

 4, Hazy clouds : fine : frosty. 5. Rain with fog : OTercast at night : slight frost. 

 6. Clear sky and low ground-fog: exceedingly fine. 7. Overcast. 8. Rain: 

 cloudless, and very fine. 9. Frosty and foggy: fine: dense fog. 10. Foggy: 

 uniform haze: overcast. 11. Overcast. 12. Foggy: cloudy and cold. 13. 

 Slight drizzle : hazy. 14. Rain: drizzly. 15. Rain : clear at night. 16. Cloudy: 

 very fine: drizzly. 17. Boisterous: fine: clear. 18. Densely overcast: rain. 



19. Cloudy: fine: clear. 20. Clear and fine. 21. Slight snow-showers. 22. 

 Frosty: densely clouded. 23. Clear and frosty: cloudless: clear and frosty. 

 24. Hazy: slight snow: cloudy at night. 25. Clear and fine. 26. Drizzly: 

 densely overcast. 27. Clear. 28. Driftinjr snow : clear and frosty throughout : 

 severe frost at night. 29. Cloudy : clear. 20. Clear. 31. Cloudy : fine : overcast. 



Mean temperature of the month 37°'17 



Mean temperature of Dec. 1848 41 '75 



Mean temperature of Dec. for the last twenty-three years S9 "85 



Average amount of rain in December 1*58 inch. 



Boston. — Dec. 1. Fine. 2. Rain: rain a.m. and p.m. 3. Rain: rain a.m. 

 4. Fine. 5. Cloudy : rain a.m. and p.m. 6. Fine. 7. Cloudy. 8. Rain : 

 rain a.m. 9. Fine. 10. Cloudy. 11. Rain: rain a.m. and p.m. 12. Fine. 

 13, 14. Cloudy. 15. Cloudy: rain a.m. and p.m. 16. Fine, 17. Cloudy: rain 

 early A.M. 18. Cloudy : rain a.m. and p..m. 19. Fine: rain a.m. and stormy. 



20. Fine. 21. Cloudy: rain a.m. 22. Cloudy. 23. Fine. 24. Cloudy: 

 rain a.m. 25. Cloudy. 26. Fine. 27, 28. Fine: stormy. 29. Fine: 

 snow A.M. 30. Fine. 31. Cloudy. 



Applegarlk Manse, Dumfries-shire, — ^Dec. 1. Frost a.m. : fog : wet p.m. 2. 

 Storm of wind and rain. 3. Blowing hard : wet : calm p.m. 4. Fine clear frosty 

 day. 5. Snow a. m : wet p.m. 6. Rain and wind. 7. High wind: rain p.m. 

 8. Rain, but not heavy. 9. Fog and light rain. 10. Fog all day. 11. Fair and 

 frosty. 12. Clear and cold. 13. Dull and cold: sleet p.m. 14. Fine a.m. : 

 cloudy and stormy p.m. 15. Foggy, with showers. 16. Fine a.m. : dull and 

 damp p.m. 17. Fine, with slight showers. 18. Wet all day. 19,20. Slight 

 frost: fine. 21. Slight frost : fine : cloudy. 22. Slight frost: clear and fine. 23. 

 Hard frost : cloudy p.m. 24. Change : soft : slight shower. 25. Frost again : 

 mild P.M. 26. Slight frost : shower p.m. 27, Frost: clear: high wind p.m. 

 28,29. Very hard frost : sprinkling of snow. SO. Frost: clear and fine. 31. 

 Frost very hard : thermometer 18'. 



Mean temperature of the month 37°'l 



Mean temperature of Dec. 1848 39*8 



Mean temperature of Dec. for the last twenty-five years ... 38 •! 



Mean rain in December 1'40 inch. 



Ditto average for twenty years in December 2*94 inches. 



Sandwick Man.'e, Orkney. — Dec. 1. Fine : cloudy. 2,3. Showers. 4. Snow- 

 showers. 5. Showers. 6. Cloudy : clear. 7. Cloudy : drizzle. 8. Showers: 

 drizzle. 9. Cloudy : showers : rain. 10 Drizzle : clear : aurora. 11, 12. Cloudy : 

 clear : aurora. 13. Cloudy. 14. Rain: cloudy. 15. Cloudy : showers. 16. 

 Rain : showers: clear. 17. Cloudy : showers.. 18. Showers: damp : showers. 

 19. Bright : showers ; sleet. 20. Fine: frost: fine. 21. Fine: frost: aurora. 

 22. Clear : frost : hazy. 23. Rain : cloudy. 24. Fine : damp. 25, 26. Showers. 

 27. Hail-showers. 28. Snow-drift: thunder: snow-drift. 29. Cloudy: clear. 

 30. Showers: cloudy. 31. Clear: cloudy. 



