Meteorological Observations. 



303 



I think, therefore, that the chemical formula of hornblende is 

 exactly the same as that of pyroxene, and that we must consequently 

 return to an opinion formerly maintained by M. G. Rose, but which 

 he has since abandoned, attributing, I think, to the presence of the 

 sesquioxide an influence which it should not have upon the normal 

 constitution of the mineral. The secondary dimorphism of pyroxene 

 and hornblende would also be sufliciently explained by the very pecu- 

 liar gaseous medium in which the latter mineral appears to have 

 been formed, and the curious facts noticed by M. G. Rose in ura- 

 lite would favour this explanation. — Comptes Rendus, February 27 

 1854. p. 390. 



METEOROLOGICAL OBSERVATIONS FOR FEB. 1854. 

 ChUwick. — February]. Cloudy: rain. 2. Overcast: clear, with bright sun: 

 frosty. 3. Frosty : dense fog. 4. Frosty : very fine : overcast. 5. Clear : cloudy! 

 6. Fine. 7. Cloudy : clear at night. 8. Clear : cold and dry : overcast. 9. 

 Cloudy: rain. 10. Clear and frosty : cloudy and cold : clear. 11. Cloudy and 

 fine: hazy. 12. Foggy: clear and fine. 13. Frosty: cold and dry : clear, with 

 sharp frost at night. 14. Sharp frost : fine. 15. Overcast. 16. Cloudy : clear : 

 overcast. 17. Cloudy. 18. Drifting snow : clear and cold : boisterous at night! 

 19. Clear and cold. 20. Overcast. 21. Clear and fine. 22. Fine: cloudy. 23! 

 Clear. 24. Cloudy. 25, 26. Very clear. 27. Uniformly overcast : clear :'overl 

 cast. 28. Fine. 



Mean temperature of the month 37°-67 



Mean temperature of February 1853 32 -53 



Mean temperature of Feb. for the last twenty-eight years ... 39 -13 



Average amount of rain in Feb 1.57 inch. 



Boston.— Feb. 1. Cloudy. 2—4. Fine. 5—9. Cloudy. 10. Fine : snow am 

 11. Cloudy. 12. Fine. 13. Cloudy. 14. Fine. 15, 16. Cloudy. 17. Cloudy •' 

 rain P.M. 18. Cloudy: stormy. 19. Fine. 20. Cloudv : rain a m. and pm 

 21. Fine. 22. Fine : rain p.m. 23— 26. Fine. 27, 28. Cloudy. 



Sandivici Manse, Orkney. — Feb. 1. Showers a.m. : clear p.m. 2. Showers a.m. 

 and P.M. 3. Cloudy a.m. : cloudy, aurora p.m. 4. Cloudy a.m. and p.m. 5' 

 Sleet-sLowers a.m. : showers p.m. 6. Showers a.m. and p.m. 7. Sleet-showers 

 a.m. : hail-showers p.m. 8. Ilail-showers a.m. and p.m. 9. Snow-showers a m • 

 clear p.m. 10. Cloudy a.m. and p.m. 11. Drizzle a.m. : cloudy p.m. 12. Cloudy 

 a.m. and p.m. 13, 14. Drizzle a.m. and p.m. 15. Hail-showers a.m. and pm 

 16. Dnzzle A.M. and P.M. 17. Snow-showers a.m. and pm. 18. Snow-showers 

 A.M. : hail-showers p.m. 19. Cloudy a.m. and p.m. 20. Showers a.m. : clear p m 

 21. Bright a.m. : cloudy p.m. 22. Drizzle a.m. : showers p.m. 23. Snow-showers 

 a m. : hail-showers p.m. 24. Showers a.m. : showers, aurora p.m. 25. Showers 

 am. : aurora p.m. 26. Cloudy a.m. and p.m. 27. Rain a.m. and p.m. 28. Sleet- 

 iihowers a.m. : showers p.m. 



Mean temperature of Feb. for twenty-seven previous years ... 38°-20 



Mean temperature of this month 39 -20 



Mean temperature of Feb. 1853 !!!!!!!!!!!!.!! 33 -74 



Average quantity of rain in Feb. for thirteen previous years... 3-33 inches. 



