Meteorological Observations. 407 



Neglecting the small quantity of alkali, these numbers lead us 

 nearly to the formula 



2(CaO, Si03) + 2(A12 O^, 2Si03) + 7H0, 

 which differs completely from that of stilbite, 



CaO, Si03 + Al20^ 3Si03 + 6HO, 

 or that of epistilbite, 



CaO, Si05 + Al2O3, SSiO^ + SHO. 



The per-centage of water is also far too small for hypostilbite. 



The mineral appears to be a distinct one, and does not seem to 

 have resulted from the gradual decomposition or change of any other; 

 but it is perhaps scarcely desirable to add to the already numerous 

 names of stilbite-like minerals by adopting a new one for this sub- 

 stance until additional analyses of these nearly related species shall 

 permit of their more accurate classification. — Silliman's American 

 Journal for September 1856, p. 179. 



METEOROLOGICAL OBSERVATIONS FOR SEPT. 1856. 



Chiswick. — September 1. Very fine : thunder and lightning at night, but without 

 rain. 2. Shower : very fine: clear. 3, 4. Heavy dew in the mornings : very fine. 

 5. Slight fog : cloudy and fine. 6. Slight fog : rain at night. 7. Very fine. 8. 

 Foggy : very fine. 9. Dense fog : very fine : cloudy. 10. Slight haze : very fine. 

 11. Overcast. 12. Cloudy: very fine : rain. 13. Cloudy. 14. Clear and fine. 

 15. Fine : overcast. 16. Clear: fine. 17. Overcast: rain. 18. Rain : very fine. 



19. Clear, quite cloudless : very fine. 20. Very clear : cloudy and cold : slight 

 frost at night. 21. Fine : rain. 22. -Clear: showery: fine. 23. Clear : cloudy : 

 bright sun at intervals. 24. Clear : heavy showers. 25. Clear : dense clouds : 

 fine. 26. Fine : rain at night. 27. Heavy rain. 28. Rain : heavy showers. 

 29. Cloudy and fine. 30. Very fine : cloudy : fine at night. 



Mean temperature of the month 54°'41 



Mean temperature of Sept. 1855 56*11 



Mean temperature of Sept. for the last thirty years 56*95 



Average amount of rain in Sept 2*455 inches. 



iJos^ow.— Sept. 1 — 4. Fine. 5. Cloudy. 6. Fine. 7. Fine : rain a.m. 8, 9. Fine. 

 10. Cloudy. 11, Cloudy: rain a.m. 12. Cloudy. 13. Cloudy: rain a.m. and 

 P.M. 14. Fine. 15. Cloudy. 16. Fine. 17. Cloudy: rain p.m. 18,19. Fine. 



20. Cloudy. 21,22. Fine: rain p.m. 23. Cloudy. 24— 26. Fine. 27—29. 

 Cloudy : rain a.m. and p.m. 30. Cloudy. 



Sandwich Manse, Orkney. — Sept. 1. Clear a.m. : clear, aurora p.m. 2. Bright 

 A.M. : clear p.m. 3. Clear a.m. : cloudy p.m. 4, 5. Clear a.m. and p.m. 6. 

 Bright a.m. : cloudy p.m. 7. Drizzle a.m. : damp p.m. 8. Damp a.m. : fog p.m. 

 9. Fog A.M. and p.m. 10. Fog a.m. : showers p.m. 11, 12. Bright a.m. : showers 

 P.M. 13. Showers, bright a.m. : cloudy p.m. 14. Drizzle, bright a.m. : showers 

 P.M. 15. Showers A.M. and P.M. 16. Showers a.m. : rain, lightning p.m. 17. 

 Showers a.m. : clear p.m. 18. Sleet showers a.m. : showers p.m. 19. Cloudy 

 A.M.: showers P.M. 20. Showers a.m. : cloudy p.m. 21. Bright a.m. : showers 

 P.M. 22. Rain a.m. : showers p.m. 23. Bright a.m. : showers p.m. 24. Rain a.m. : 

 showers p.m. 25. Showers a.m. and p.m. 26. Clear a.m. : clear, aurora p.m. 

 27. Hoar-frost a.m. : showers, aurora p.m. 28. Damp a.m.: cloudy p.m. 29. 

 Showers a.m. and p.m. 30. Showers a.m. : clear p.m. 



Mean temperature of Sept. for previous twenty-nine years ... 52°'28 



Mean temperature of this month 50 *83 



Mean temperature of Sept. 1855 52*74 



Average quantity of rain in Sept. for previous sixteen years ... 2*82 inches. 



