'466 Meteorological Obseitaiiuns. 



ON A LVNAR VAPOUR BOW, 



To the Editors of the Annals of Natural Ilistorij. 



Santlwick Manse, 16th Ma}-, 1855. 

 Gentlemen, — On the 28th April, at 11 p.m., and for an hour 

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

 moon was nearly full, and giving good light, a beautiful phpenomenou 

 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 conies to the very feet of 

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



I am, yours very truly, 



Charles Clouston. 



METEOROLOGICAL OBSERVATIONS FOR APRIL 1855. 



ChmvicA: — 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. Cloiidy and cold : slight rain. 9. 

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

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

 cast. IG. 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: tine: overcast. 27. Dry 

 haze : fine. 2-f'. Ilazy : 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 tweuty-nine years ... 47 '17 

 Average amount of rain in April 1"59 inch. 



Boston. — ,\pril 1. Fine. 2. Cloudy. 3. Cloudy : rain p.m. 4. Cloudy. 5 — 7. 

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

 stormv. 11. Cl'oudv : 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. Hail-showers a.m. : 

 cloudv p.m. 21. Bright A.M.: clear, fine p.m. 22. Clear a.m. : clear, fiue p.m. 

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

 cloudv 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 



Meaa temperature of this month 43 "20 



Mean temperature of April 1854 44 -68 



Average quantity of rain in April for fourteen previous years 1*83 inch. 



