466 Meteorological Observations. 



ON A LUNAR VAPOUR BOW. 



To the Editors of the Annals of Natural History. 



Sandwick Manse, ICth May, 1855. 

 Gentlemen, — On the 28th April, at 1 1 p.m., and for an hour 

 or two afterwards at least, we had dense ground vapour ; and as the 

 moon was nearly full, and givmg good light, a beautiful phsenomenon 

 was very bright and striking, which I do not recollect to have seen 

 described, though I have on several occasions seen it here before, 

 and which, for want of a better name, I must call a lunar vapour 

 bow, or rather circle. It is formed on the opposite side to the 

 moon, and forms a complete circle, which comes to the very feet of 

 the spectator, with his shadow in the middle of it. 



I am, yours veiy truly, 



Charles Clouston. 



METEOROLOGICAL OBSERVATIONS FOR APRIL 1855. 



Chiswick. — April 1. Clear and frosty: overcast. 2. Frosty and foggy: fine. 

 3. Cloudy : rain. 4. Cloudy and cold : clear and frosty. 5. Slight haze : very 

 fine. 6. Fine. 7. Overcast : very fine. 8. Cloudy and cold : slight rain. 9. 

 Cloudy. 10 Boisterous. 11. Cloudy and boisterous: rain at night. 12. Clear: 

 very fine. 13. Overcast : slight rain : cloudy : fine. 14. Foggy : fine. 15. Over- 

 cast. 16. Foggy: cloudless and exceedingly fine. 17. Fine: clear. 18. Fine. 

 19. Slight haze: fine. 20,21. Very fine : nights frosty. 22. Cold dry easterly 

 wind. 23. Fine : sharp frost at night. 21. Clear and dry : overcast. 25. Densely 

 overcast: cloudy and cold. 26. Overcast and cold: fine: overcast. 27. Dry 

 haze : fine. 28. Hazy : fine : overcast. 29. Cloudy and cold. 30. Uniformly 

 overcast : cloudy at night. 



Mean temperature of the month 46°*08 



Mean temperature of April 1854 47 '53 



Mean temperature of April for the last twenty-nine years ... 47 '17 

 Average amount of rain in April 1-59 inch. 



Boston. — April 1. Fine. 2. Cloudy. 3. Cloudy : rain p.m. 4. Cloudy. 5 — 7. 

 Fine. 8. Cloudy : rain a.m. and p.m. 9. Rain : rain a.m. : stormy. 10. Fine : 

 stormy. 11. Cloudy : rain p.m. 12. Fine. 13. Cloudy. 14. Fine. 15. Cloudy, 

 16—20. Fine. 21, 22. Cloudy. 23, 24. Fine. 25—30. Cloudy. 



Sandwick Manse, Orkney. — April 1. Clear a.m. and p.m. 2. Bright a.m. : 

 hazy P.M. 3. Bright a.m. : clear p.m. 4. Clear a.m. : cloudy p.m. 5. Bright a.m. : 

 drops P.M. 6. Rain a.m. : clear, aurora p.m. 7. Showers a.m. : sleet-showers p.m. 

 8. Snow-showers A.M. and P.M. 9. Rain a.m. : showers p.m. 10. Showers a.m. : 

 rain, clear p.m. 11. Cloudy a.m. and p.m. 12. Rain a.m. : clear, aurora p.m. 

 13. Bright, solar halo, a.m. : rain, aurora, p.m. 14,15. Bright a.m. : rain p.m. 16. 

 Sleet-showers a.m. : showers p.m. 17. Cloudy a.m. : cloudy, aurora p.m. 18. Rain 

 A.M. : cloudy P.M. 19. Rain, bright a.m. : showers p.m. 20. Ilail-showers a.m. : 

 cloudy P.M. 21. Bright A.M.: clear, fine p.m. 22. Clear a.m. : clear, fine p.m. 

 23. Bright a.m. : cloudy p.m. 24. Hazy a.m. : cloudy p.m. 25. Damp a.m. : 

 cloudy P.M. 26. Cloudy a.m.: clear p.m. 27. Cloudy a.m. : clear, fine p.m. 

 28. Bright a.m. : clear, fine, aurora p.m. 29. Clear a.m. : clear, fine p.m. 30. 

 Clear a.m.: damp p.m. 



Mean temperature of April for twenty-eight previous years . 43°'48 



Mea.i temperature of this month 43 -20 



Mean temperature of April 1854 44*68 



Average quantity of rain in April for fom-teen previous years 1'83 inch. 



