Meteorological Observations. 819 



proper to operate upon at least 12,000 to 15,000 litres in order to 

 collect at least 10 milligrammes of platina. 



3rd. The author states that, until researches have heen made on 

 a large scale, his experiments may serve as approximative. 



If it be true that night air is richer in ammonia than the air of the 

 day, this fact may be explained by the phsenomena presented by the 

 nutrition of plants, by the circumstance that the ammonia which 

 accumulates in the air during the day and during the night is dis- 

 solved and precipitated by the dew at sun-rise. — Ibid. Juin 1849. 



METEOROLOGICAL OBSERVATIONS FOR AUG. 1849. 



Chiswick. — August 1. Very fine : clear. 2. Very fine : slight rain, 8. Slight 

 rain : overcast : cold at night. 4. Clear and fine. 5. Fine : cloudy. 6. Cloud- 

 less: very fine. 7. Fine : overcast : rain. 8. Clear : very fine : lightning. 9. 

 Foggy : very fine : heavy showers. 10. Hazy: very fine ; clear. 11. Clear: 

 cloudy: rain. 12. Overcast : clear : rain. 13. Showery. 14. Cloudy and fine. 

 15. Very fine. 16. Showery : very clear at night. 17 — 19. Fine. 20, Cloudy. 

 21 — 23, Very fine, 24. Very fine : hazy. 25. Uniformly overcast: very fine. 



26, 27. Very fine, 28. Very fine : slight rain at night. 29. Overcast. 30. 

 Dry haze : rain at night. SI. Hazy : cloudy and fine. 



Mean temperature of the month 62°*91 



Mean temperature of Aug. 1848 58 '74 



Mean temperature of Aug. for the last twenty-three years 62 '18 

 Average amount of rain in August 2*41 inches. 



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

 Cloudy. 8. Cloudy : rain early a.m.: thermometer 79° 3 p.m. 9. Fine : rain 

 P.M. 10, 11, Cloudy : rain p,m, 12. Fine. 13. Cloudy : rain p.m. 14. Cloudy. 

 15. Fine. 16. Cloudy. 17, Fine, 18, Cloudy: rain a.m. 19. Fine. 20 — 

 23. Cloudy. 24— 26. Fine. 27— 29. Cloudy, SO. Cloudy: rain p.m. 31. Fine. 



Applegarth Manse, Dumfries -shire. — Aug, 1. Fair. 2, 3, Fair : a few drops p.m. 

 4. Fair and warm. 5,6. Fair: warm : cloudy p.m. 7. Frequent showers. 8. 

 Fair and fine : beautiful day. 9. Very warm : thunder: showers. 10. Heavy 

 shower : very warm. 1 1, Very heavy rain : thunder. 12. Rain : river flooded. 

 13. Heavy rain. 14, Showers a, m, : cloudy p,m. 15. One shower : dull and 

 cloudy. 16. Heavy showers : hail. 17. Wet a.m. : fine : thunder p.m. 18. Fre- 

 quent showers. 19. Fair: calm: cloudy. 20. Fair and fine. 21. Fair, but 

 dull and cloudy. 22. Light drizzling showers. 23. Showers frequent, not 

 heavy. 24. Fair, but cloudy. 25. Shower during night : cleared. 26. Showers 

 A.M. : fine. 27. Fair and bracing: harvest day. 28. Fair, but dull : rain p.m. 

 29. Fair and fine all day. 30. Rain throughout. 31. Fair and fine: dull: 

 cleared. 



Mean temperature of the month 56°*7 



Mean temperature of Aug. 1848 53 '1 



Mean temperature of Aug. for the last twenty-five years ... 57 '1 



Mean rain in Aug. for twenty years 3*60 inches. 



Sandwich Manse, Orkney. — Aug. 1. Drizzle. 2 — 4. Drizzle : showers. 5. Fog : 

 cloudy. 6. Fog. 7. Cloudy. 8. Rain : fog. 9. Hazy : fog. 10. Hazy: 

 cloudy. 11. Cloudy : rain. 12. Clear : clear, aurora. 13. Bright : clear. 14. 

 Drizzle : rain. 15. Clear. 16. Bright : cloudy, 17, Showers, 18. Bright: 

 cloudy a.m. 19. Damp: cloudy. 20. Drizzle: damp, 21. Rain : fine. 22. 

 Rain : clear. 23. Clear. 24. Clear : cloudy, 25. Kain. 26. Bright : showers. 



27. Bright : cloudy. 28. Cloudy : showers. 29. Drizzle : damp. 30. Bright : 

 damp. 31, Clear : fine. 



