Meteorological Observations. 367 



chloride of potassium, chloride of sodium and hydrochlorate of am- 

 monia, were capable when heated of dehydrating the oxide of tin 

 rapidly. This action of the chlorides is the more remarkable, be- 

 cause they crystallize in the anhydrous state. 



Protoxide of tin, when dehydrated under the circumstances de- 

 scribed, does not always appear in the same state ; it is sometimes 

 black and crystalline, at other times brown, and often as red as 

 minium. — Ann. de Cfi. et de Phys., December 1844. 



METEOROLOGICAL OBSERVATIONS FOR FEB. 1845. 



Chiswick. — February 1. Sharp frost: snow-showers at night. 2. Clear and 

 frosty : cloudy : clear and frosty. 3. Hazy and drizzly. 4, Overcast : cloudy : 

 frosty. 5. Overcast: fine: clear. 6. Clear throughout: sharp frost at night. 



7. Frosty : overcast : clear and frosty. 8. Overcast : frosty. 9. Clear and frosty : 

 fine: slight frost. 10. Overcast: snowing. IJ. Frosty: most intense frost at 

 night, the lowest being 35° below the freezing-point. 12. Intense frost, only 4° 

 above zero at 8 a.m. : dry air and frosty : bright sun : severe frost at night. 13. 

 Overcast: snowing: sleet and rain. 14. Thawing: clear and fine: overcast. 

 15. Clear and frosty. 16. Fine: densely overcast : frosty. 17. Foggy: fine: 

 clear and frosty. 18. Foggy: hazy clouds. 19. Overcast: clear : frosty. 20, 

 21. Clear and frosty throughout. 22. Snow-showers : foggy. 23. Snow : rain. 

 24. Cloudy and cold. 25. Frosty: fine : rain. 26. Clear : fine : densely over- 

 cast. 27, 28. Overcast. — Mean temperature of the month 8° below the average. 



Boston. — Feb. 1. Cloudy: snow a.m. and p.m. 2. F'ine. 3. Cloudy: rain 

 A.M. and P.M. 4. Cloudy. 5. Fine : stormy night. 6. Windy, 7. Fine. 



8. Cloudy. 9. Fine. 10. Snow. 11, 12. Fine. 13. Cloudy: rain and snow- 

 A.M. 14, 15. Fine. 16. Cloudy : rain early a.m. 17,18. Fine. 19. Cloudy. 

 20. Fine. 21. Froggy. 22. Cloudy. 23. Snow : rain p.m. 24. Cloudy. 25. 

 Fine : rain p.m. 26. Fine. 27. Cloudy. 28. Fine. 



The above you will find a very cold month; I think you will find nothing like 

 it since February 1838. 



Sandwich Manse, Orkney. — Feb. 1. Frost : cloudy. 2. Rain. 3. Bright : 

 cloudy. 4. Cloudy : sleet-showers. 5. Snow-showers. 6". Snow-showers : 

 snow-drift. 7. Snow-showers. 8. Snow-showers: clear. 9, 10. Thaw : cloudy : 

 drops. 11. Clear : showers. 12. Cloudy : showers. 13. Showers. 14. Snow: 

 cloudy. 15. Showers: cloudy. 16. Fog: cloudy. 17. Bright: clear : fine. 

 18, 19. Fine : cloudy. 20. Showers. 21. Showers: clear : fine. 22. Showers: 

 snow-showers. 23. Showers. 24. Cloudy : clear : aurora. 25. Clear : cloudy. 

 26. Cloudy : clear : frost. 27. Bright : cloudy. 28. Cloudy : clear. 



jipplegarth Manse, Dumfriesshire. — Feb. 1. Frost. 2. Severe frost : rain p.m. 



3. Fine thaw. 4. Frost: thaw p.m. 5. Thaw a.m. : frost p.m. 6. Frost: clear 



and fine. 7,8. Hard frost. 9. Snow. 10. Slight thaw. 11. Snow-showers. 



12. Frost A.M. : rain P.M. 13. Heavy rain. 14. Fro^t : shower : snow and hail. 



15. Frost: thaw p.m. 16, 17. Fine. 18. Fine spring day. 19. Frost: fine. 



20. Slight frost : fine. 21. Fine : no frost. 22. Slight frost : snow. 23. Slight 



frost : fine. 24. Frost: rain p.m. 25. Fresh : fine. 26. Frost a.m. : fine. 27. 



Frost 28. Frost : fine. 



Mean temperature of the month 34°*5 



Mean temperature of Feb. 1844 32 -9 



Mean temperature of Feb. for twenty years 36 -0 



