Meteorological Observations. 399 



solution, explains why the jihcenoraena observed by M. Henri Rose 

 during the crystallization of the transparent acid, are not in general 

 so intense in the solution of the opake acid. 



10th. That the difference which has been observed in the action 

 of the two arsenious acids on the tincture of litmus is merely appa- 

 rent. — Journ. de Chivi. Med., Fevrier ]848. 



METEOROLOGICAL OBSERVATIONS FOR MARCH 1848. 



Chiswick. — March I. Constant rain: barometer very low. 2. Cloudy and 

 damp. 3. Very fine. 4. Hoar-frost : slight haze. 5. Rain. 6. Cloudy : fine : 

 OTercast. 7. Foggy : slight haze : clear. 8. Frosty and foggy ; overcast : slight 

 rain. 9. Overcast and mild. 10. Rain: fine : cloudy, 11. Boisterous, with 

 heavy showers. 12. Showery. 13. Cloudy and cold : heavy rain at night. 

 14. Fine : clear and frosty. 15. Overcast. 16, 17. Rain. 18. Foggy: fine. 

 19. Foggy: fine: showery. 20. Heavy rain. 21. Hazy and damp : cloudy: 

 showery : clear : frosty at night. 22. Cloudless : boisterous, with rain at night. 

 23,24. Cloudy and fine. 25. Uniform haze : cloudy and fine. 26. Overcast: 

 slight rain. 27. Foggy : drizzly. 28. Very fine : rain at night. 29. Hazy and 

 damp : fine. 30. Foggy : slight rain : clear. 31. Hazy : very fine : clear at night. 



Mean temperature of the month 42°*5 



Mean temperature of March 1847 40 -11 



Mean temperature of March for the last twenty years 42 '8 



Average amount of rain in March l'36inch. 



Boston. — INIarch 1. Cloudy : rain last night. 2. Cloudy : rain p.m. 3. Fine: 

 rain p.m. 4. Fine. 5. Rain. 6 — 9. Cloudy. 10, 11. Cloudy: rain a.m. 

 12. Cloudy : rain a.m. and p.m. 13. Fine : rain p.m. 14, 15. Fine. 16. Rain : 

 rain a.m. and p.m. 17. Cloudy: rain a.m. and p.m. 18. Cloudy. 19. Cloudy : 

 rain P.M. 20. Fine. 21. Rain : rain a.m. and p.m. 22. Fine : rain p.m. 23— '25. 

 Cloudy. 26. Cloudy : rain p.m. 27. Cloudy : rain a.m. and p.m. 28. Rain: 

 rain a.m. 29. Cloudy : rain a.m. .30. Fine : rain p.m. 31. Rain. 



Apphgarth Manse, Dumfries-shire. — March 1. Fair, but cloudy and raw. 2, 



3. Fair and clear: raw frost a.m. 4. Fair and clear : hard frost a.m. : rain p m. 

 5 — 7. Cloudy, but fair. 8. P^ine : wet a.m. : cleared. 9. Rain in the night : 

 cleared P.M. 10. Showers : hail. 11. Frequent showers: hills covered with snow. 

 12. Clear cold day. 13. Clear cold day: frost a m. : fine. 14. Frost a.m.: 

 cloudy: rain p.m. 15. Frequent showers. 16. Fair, but chilly. J 7. Rain 

 during night : drizzling a.m. 18. Rain early a.m. : fine. 19. Rain and hail: 

 snow P.M. 20. Frost: hail: thaw p.m. 21. Frost: snow on hills: hail. 22. 

 Frost a.m.; heavy rain p.m. 23. Frequent showers. 24. Very fine: warm. 



25. Very fine. 26. Rain nearly all day. 27. Very fine. 28. Wet till noon : 

 cleared. 29. Fine: clear: told. 30. Fine all day : light clouds. 31. Veiy 

 fine : clear and warm. 



Mean temperature of the month 41°'2 



Mean temperature of March 1847 42 '5 



Mean temperature of March for twenty-five years 39 "1 



Mean rain in March for twenty years 2*35 inches. 



Rain in March 1847 127 „ 



Sandwich Manse, Orkney. — March 1. Clear. 2. Clear: cloudy. 3. Clear. 



4. Damp. 5. Damp : drops. G. Damp : cloudy. 7. Cloudy. 8. Showers : 

 clear : aurora. 9. Bright: showers. 10. Clear: hoar frost. 11. Cloudy : showers. 

 12. Bright : clear. 13. Clear : hoar-frost. 14. Cloudy: rain. 15. Bright: 

 clear: aurora. 16. Showers. 17. Cloudy ; showers. 18. Bright : cloudy. 19. 

 Bright: clear: aurora. 20. Snow : tkar : aurora. 21. Clear: frost: cloudy. 

 22. Clear: cloudy. 23. Rain : drops. 24. Clear: cloudy. 25. Bright: cloudy. 



26. Rain. 27. Clear: fog. 28. Fog: rain. 29, 30. Bright : cloudy. 31. Clear: 

 cloudy. 



