Meteorological Observations. 569 



From the similarity of these results, M. Damour is of opinion that 

 this jade may be ranked with tremolite ; and if this opinion should 

 be adopted, he observes, that in collections oriental jade will here- 

 after be classed as compact tremolite. — Ann. de Ch. et de Phys., 

 Avril 1846. 



METEOROLOGICAL OBSERVATIONS FOR APRIL 1846. 



Chiswick. — April 1. Fine. 2. Cloudy: showery. 3. Clear and windy: 

 cloudy and fine. 4. Hazy : heavy rain. 5. Heavy rain : clear. 6. Heavy rain : 

 cloudy. 7. Slight rain : densely overcast. 8 — 10. Fine. 11. Dry haze. 12, 



13. Cloudy and fine. 14. Clear: dry haze : overcast. 15. Densely clouded : 

 dry haze : densely overcast. 16. Slight dry haze. 17. Foggy. 18. Rain. 19. 

 Cloudy and cold : clear. 20. Showery : frosty at night. 21. Foggy : cloudy 

 and fine. 22. Foggy. 23. Heavy clouds : rain. 24. Rain : dark haze : cloudy. 



25. Hazy and damp : showery : hazy : foggy. 26. Extraordinary fall of rain 

 early a.m. : dense clouds : overcast at night. 27. Clear and fine. 28. Very fine. 

 29, 30. Clear : very fine : overcast. 



Mean temperature of the month 47°*36 



Mean temperature of April 1845 48 -41 



Average mean temperature of April for the last twenty years 47 "19 

 Average amount of rain in April 1 *47 inch. 



Boston. — April 1. Fine. 2. Rain. 3 Windy : rain r.M. 4. Cloudy: rain 

 p.m. 5. Cloudy : rain a.m. and p.m. 6. Cloudy. 7. Rain. 8. Cloudy : rain 

 early a.m. 9, 10. Fine. 11. Cloudy : rain p.m. 12. Fine. 13. Fine: rain 

 early a.m. 14. Fine : rain p.m. 15. Cloudy : rain early a.m. 16 — 18. Cloudy. 

 19. Cloudy: rain a.m. 20 — 22. Fine. 23. Fine : rain a.m. 24, 25. Fine. 26. 

 Cloudy : rain a.m. 27. Fine: rain a.m. 28. Cloudy. 29. Fine: ice this 

 morning. 30. Cloudy. 



Sandtvick Manse, Orkney. — April 1. Snow : clear. 2. Showers : clear. 3. 

 Snow-showers. 4. Snow-showers: frost: snow-showers. 5. Showers. 6. Showers: 

 clear : aurora. 7. Clear : drops. 8. Cloudy : clear. 9. Bright : cloudy. 10. 

 Bright: showers. 11. Bright: rain. 12. Fog: damp. 13. Damp : drizzle. 



14. Clear. 15. Fog : cloudy. 16. Cloudy. 17. Cloudy: damp : fog. 18. Rain : 

 clear. 19 — 21. Fine: clear. 22. Clear: cloudy. 23,24. Clear. 25. Cloudy. 



26. Sleet showers : hail-showers. 27. Bright : cloudy. 28. Hail-showers : 

 cloudy. 29. Snow-showers : clear. 30. Cloudy : clear. 



■dpplegarth Manse, Dumfriesshire. — April 1. Wet. 2. Wet a.m. : cleared and 

 fine. 3. Wet a.m. : cleared. 4. Slight showers : frost a.m. 5. Fair, but chilly. 

 6. Fair, but very bleak. 7. Fair. 8. Fair : frost a.m. 9. Fair : frost : fine. 

 10. Fine. 11. Rain all day. 12. Rain p.m. : thunder. 13. Frequent heavy 

 showers. 14. Frequent heavy showers : hail: fine p.m. 15- Frequent heavy 

 showers: rain all day. 16. Very fine spring day. 17, 18. Dropping day. 

 19. Fair, though chilly. 20. Frost, slight: fine. 21. Hoar-frost: rain p.m. 

 22. Slight showers. 23, 24. One slight shower. 25. Heavy shower : fair p.m. 

 26. Slight shower : fine. 27. Slight shower : frost a.m. 28. Frost a.m. : fine. 

 29. Frost a.m. : a slight shower. 30. A dropping day. 



Mean temperature of the month 45°"6 



Mean temperature of April 1845 48 *2 



Mean temperature of April for twenty-three years 44 '2 

 Mean rain in April for eighteen years 1 '69 inch. 



Phil. Mag. S. 3. No. 190. Suppl. Vol. 28. 2 Q 



