Meteorological Observations. 319 



solution at a temperature of 572° to 752° F. And if hitherto the 

 experiments have principally home upon the extreme conditions of 

 the different modes of formation, hy the dry and humid way, a 

 similar effect produced in these extreme states, such as quartz and 

 corundum, may perhaps authorize us in concluding that it would 

 also take place in the intermediate conditions. — Comptes Rendus, 

 July 17, 1854, p. 135. 



METEOROLOGICAL OBSERVATIONS FOR FEB. 1855. * 



Chiswick. — February 1. Clear: overcast. 2. Drifting snow. 3. Hazy. 4. Dense 

 fog : foggy throughout. 5. Overcast : drizzly. 6. Snow-flakes : slight rain. 

 7. Cloudy: clear and frosty. 8. Snowing: drifting snow : boisterous at night. 

 9. Overcast: sharp frost. 10. Clear and frosty : severe frost at night. 11. Ther- 

 mometer within 1 degree of zero : clear. 12. Overcast: clear and cold: partially 

 overcast. 13. Snowing: cloudy : clear : intense frost : thermometer at zero. 14. 

 Clear and cold. 15. Snow-flakes : bright sun : frosty haze. 16. Snow-showers : 

 overcast. 17. Snowing, with cold wind : clear : severe frost. 18. Frosty : hazy : 

 severe frost at night. 19. Uniform haze : clear and frosty. 20. Clear and frosty. 

 21. Overcast. 22. Hazy. 23. Overcast : snowing. 24. Fine. 25. Overcast. 

 26. Rain. 27. Foggy: rain. 28. Drizzly: large halo round the rnooii in the 

 evening. 



Mean temperature of the month 28 o, 01 



Mean temperature of l'eb. 1854 37*67 



Mean temperature of Feb. for the last twenty-nine years ... 39 ^07 

 Average amount of rain in Feb l - 54 inch. 



Boston, — Feb. 1. Cloudy. 2. Fine. 3. Cloudy : rain and hail p.m. 4. Foggy : 

 rain p.m. 5. Foggy : rain a.m. 6, 7. Cloudy : snow p.m. 8. Cloudy : stormy p.m. 

 9 — 11. Cloudy. 12 — 14. Fine. 15. Fine: snow a.m. 16. Fine: thermometer 

 early a.m. 6°-5. 17— 22. Fine. 23. Cloudy. 24. Fine : snow a.m. 25. Cloudy. 

 26. Cloudy : rain p.m. 27. Cloudy : snow a.m. 28. Cloudy. 



Sandwich Manse, Orkney. — Feb. 1. Damp a.m. : sleet-showers p.m. 2. Thaw, 

 bright a.m. : clear, frost p.m. 3. Thaw, showers a.m. : damp p.m. 4. Thaw, 

 damp a.m. : showers p.m. 5. Showers a.m. and p.m. 6. Sleet-showers a.m. : 

 clear p.m. 7. Clear, frost a.m. : snow-showers p.m. 8. Bright, frost a.m. : cloudy, 

 frost p.m. 9. Clear, frost a.m. : cloudy, frost p.m. 10. Cloudy a.m. and p.m. 

 11. Snow-showers a.m. and p.m. 12. Snow-showers a.m. : snowing, aurora p.m. 

 13. Snow-drift a.m. : clear p.m. 14. Snow, bright a.m. : clear, aurora p.m. 15. 

 Snow, bright a. m : cloudy p.m. 16. Snow, bright a.m. : clear p.m. 17. Snow, 

 thaw a.m. : cloudy p.m. 18. Snow, clear a.m. : clear p.m. 19. Snow, clear a.m.: 

 cloudy p.m. 20,21. Snow, clear a.m. : clear, aurora p.m. 22. Snow, clear a.m. : 

 lunar halo p.m. 23. Snow, cloudy a.m. : snow drift p.m. 24. Snow drift a.m. and 

 p.m. 25. Snow, cloudy a.m. : snow, clear p.m. 26. Snow-showers a.m. : snow, 

 clear p.m. 27. Snow, bright a.m. : snow clouds p.m. 28. Thaw a.m. : raiu p.m. 



Mean temperature of Feb. for twenty-eight previous years . 38 0- 24 



Mea.i temperature of this month 31 - 64 



Mean temperature of Feb. 1854 39 -22 



Average quantity of rain in Feb. for fourteen previous years 339 inches. 



The mean temperature of this month is lower than that of any month for the 

 last twenty-eight years — the whole period of observation — except Februaiy 1838, 

 •hen it was31 0, 31, and when there was snow during all the month and for three 

 Weekl previously. This month it lay from the 1 lth till the last day, and the drift 

 00 the 23rd and 24th formed high wreaths in many places, rendering the roads 

 impassable to vehicles. 



