Meteorological Observations. 487 



continue the agitation till particles of mercury are no longer visible 

 with a glass. 



According to M. Vogler, this method is particularly to be recom- 

 mended, because it requires less time than trituration, is more con- 

 venient and less hurtful. At all events, the process which includes 

 warming the mortar before trituration should be abandoned ; for by 

 these means a still larger portion is lost in dust, and the mercurial 

 vapour becomes more hurtful to the operator. — Journ. de Ph. et de 

 Ch., Sept. 1848. 



METEOROLOGICAL OBSERVATIONS FOR OCT. 1848. 

 Chiswick. — October 1. Densely overcast : clear. 2. Heavy clouds : fine : over- 

 cast. 3. Very fine. 4. Rain : cloudy. 5. Cloudy and mild : clear. 6. Very 

 fine. 7. Slight fog : very fine: heavy rain. 8. Very fine : heavy rain. 9. Rain. 



10. Cloudy. 11,12. Clear and fine. 13. Clear: cloudy. 14. Rain. 15,16. 

 Hazy: rain. 17,18. Cold rain. 19. Cloudy. 20. Cold rain. 21. Rain. 

 22. Rain: clear. 23. Overcast: rain. 24. Very clear: overcast: rain. 25. 

 Boisterous, with slight rain. 26. Slight fog : fine : clear. 27. Heavy rain. 

 28. Heavy showers, with intervals of sunshine. 29. Low clouds : overcast : 

 foggy. 30. Fine : overcast : foggy. 31. Foggy : rain at night. 



Mean temperature of the month 49°*27 



Mean temperature of Oct. 1847 52-14 



Mean temperature of Oct. for the last twenty years 50 '44 



Average amount of rain in Oct 256 inches. 



Boston. — Oct. 1. Cloudy : rain early a.m. 2. Fine. S. Fine : rain early a.m. 

 4. Rain. 5. Cloudy. 6. Fine. 7. Cloudy : rain early a.m. 8, 9. Fine. 10. 

 Cloudy: rain a.m. and p.m. 11,12. Cloudy. 13. Rain. 14 Cloudy: rain 

 a.m. and p.m. 15. Rain. 16. Rain : rain early a.m. 17. Rain. 18. Snow 

 and sleet. 19. Rain. 20. Fine: rain p.m. 21. Fine. 22. Rain. 23. Fine: 

 rain p.m. 24. Fine. 25. Rain : rain a.m. 26. Fine. 27. Rain : rain a.m. 

 and p.m. 28. Fine : rain p.m. 29. Cloudy. 30. Fine: rain p.m. 31. Foggy. 

 Applegarth Manse, Dumfries-shire. — Oct. 1. Drizzling day. 2. Fair a.m. : 

 slight drizzle p.m. 3. Fine : threatening p.m. 4, 5. Very wet. 6. Fair : strong 

 wind. 7. Slight showers : cleared p.m. 8. Showers a.m. : cleared : shower p.m. 

 9. Showers. 10. Slight showers. 11. Fair, but dull. 12. Slight showers. 

 13, 14. Fair and clear. 15. A very slight shower: cleared p.m 16. A very 

 slight shower. 17. Bright and fair : snow-shower seen at a distance. 18. Frost : 

 aurora borealis. 19. Frost. 20. Frost, but mild. 21. Slight rain. 22. Heavy 

 rain all day. 23. Rain morning and evening. 24. Heavy rain early, morning. 

 25. Rain early : cleared : fine. 26. Frost : fine : shower p.m. 27. Threatening 

 rain : heavy p.m. 28. Rain : hail : thunder. 29. Frequent showers. 30. Raw 

 frost a.m. : rain p.m. 31. Rain all day. 



Mean temperature of the month 46°\5 



Mean temperature of Oct. 1847 49 -5 



Mean temperature of Oct. for the last twenty five years . 46 "6 



Average amount of rain in Oct. for twenty years 3*56 inches. 



Rain in Oct. 1847 509 „ 



Sandwich Manse, Orkney. — Oct. 1. Drizzle. 2. Bright: clear: aurora. 3. 

 Damp : clear : aurora. 4. Rain : aurora. 5, 6. Cloudy. 7. Bright : clear : 

 aurora. 8. Fog: clear: aurora. 9. Rain: clear. 10. Showers: clear: showers. 



11, 12. Cloudy. 13. Fine : hoar-frost : clear. 14. Cloudy. 15. Clear: cloudy. 

 16. Showers: hail-showers. 17. Snow-showers : hail-showers. 18. Snow: snow- 

 showers : aurora australis. 19. Snow : clear : aurora. 20. Clear : aurora. 21. 

 Damp : showers: aurora. 22. Drizzle. 23. Showers : clear : aurora. 24. Rain : 

 clear : aurora. 25. Showers : clear : aurora : hoar-frost. 26 Showers : cloudy : 

 hoar-frost. 27. Damp : showers. 28. Rain: clear. 29. Shower: thunder: 

 shower: clear. 30. Shower : thunder : shower : clear. 31. Clear: hoar-frost: 

 clear. 



