Meteorological Observations. 399 



horny, simple, thin, oval operculum, with the apex slightly spiral, and 

 the nucleus subterminal. The order, which consists of the genera 

 Truncatella, Skenea, Geoynelania, and possibly Acicula and Assimi- 

 nea, differs from the Cyclostomidce in the position of the eyes and 

 the short depressed tentacles ; and would seem to be placed most 

 naturally between AuriculidcB and Cyclostomidce . By means of Ris- 

 soa and Hydrobia it has also relations with Littorinidce ; Truncatella 

 resembling the former and Assiminea the latter genus. In habits 

 they are amphibious. — Proc. of Zool. Soc. Dec. 11, 1850. 



METEOROLOGICAL OBSERVATIONS FOR SEPT. 1850. 



Chiswick. — September 1. Drizzly. 2 — 5. Very fine. 6. Clear and fine. 7. 

 Frosty : very fine. 8. Cloudy. 9. Overcast. 10. Overcast : clear. 11. Foggy: 

 very fine. 12. Foggy : fine : clear. 13. Slight fog : fine : clear. 14. Foggy : 

 fine : clear. 15. Slight fog : cloudy. 16. Overcast: cloudy. 17. Clear'and 

 fine. 18, Fine : overcast. 19. Foggy: overcast : rain. 20. Cloudy: rain. 

 21. Boisterous : heavy rain at night. 22. Heavy rain. 23. Rain : lightning in 

 the evening. 24. Cloudy : very fine. 25. Dense fog; very fine. 26. Overcast: 

 constant heavy rain. 27. Fine : thunder and heavy rain in afternoon. 28. Clear: 

 fine : clear. 29. Fine : rain. 30. Rain : rather boisterous : overcast. 



Mean temperature of the month 54°'23 



Mean temperature of Sept. 1849 57 "76 



Mean temperature of Sept. for the last tw^enty-four years . 57 '23 

 Average amount of rain in Sept 2-61 inches. 



Boston. — Sept. 1. Cloudy. 2, Fine. 3. Cloudy: rain p.m. 4 — 6. Fine. 

 7. Cloudy : rain P.M. 8—12. Cloudy. 13—15. Fine. 16,17. Cloudy. 18. 

 Fine. 19. Cloudy. 20. Fine: rain p.m. 21. Cloudy: rain early a.m. 22. Fine. 

 23. Cloudy : rain P.M. 24. Cloudy. 25. Foggy. 26. Rain : rain early a.m. 

 27. Fine : rain early a.m. 28, 29. Fine : rain p.m. 30. Cloudy : rain a.m. 



Applegarlh Manse, Dumfries-shire. — Sept. 1. Fine harvest day. 2. Fair, but 

 cloudy : threatening p.m. 3. Very fine : frost rime in the morning. 4. Frost 

 rime a.m. : one slight shower. 5, 6. Fair and fine. 7. Fair and fine, though 

 chill. 8. Fair and fine : milder. 9. F'air and fine : smelling of froit. 10. Fair 

 and fine: cloudy. 11. Fair and fine: cloudy: very warm a.m. 12. Fair and 

 fine : heavy dew : white rime. 13. Fair and fine : fine harvest weather. 14. Still 

 fair and fine. 15. Dull a.m., but cleared, and was fine. 16. Fine, but colder. 

 17. Fine, but colder : mercury falling. 18. Fine, but colder: moon wading. 



19. Fair, but threatening change. 20. Rain a.m. : rain also p.m. 21. Heavy 

 showers all day. 22. Heavy showers a.m. : cleared, but moist. 23. Very fine, 

 after showers in the night. 24. Fine harvest day. 25. Fair, but cloudy : 

 cleared p.m. 26. Rain during night and morning : cleared. 27. Succession of 

 heavy showers: flood. 28. Heavy rain during night: ditto day. 29. Rain and 

 hail p.m. 30. Showers. 



Mean temperature of the month 51°*65 



Mean temperature of Sept. 1849 53 '5 



Mean temperature of Sept. for the last twenty-eight years... 53 '17 

 Average rain in Sept. for twenty-three years 3-13 inches. 



Sand wick Manse, Orkney. — Sept. 1. Drizzle : showers. 2. Rain. S.Clear: 

 cloudy. 4. Showers : damp. 5. Showers. 6. Fine. 7. Fine: aurora. 8. Fine: 

 cloudy. 9. Fine: cloudy. 10. Cloudy: aurora. 11. Fine: fog. 12. Fine: 

 cloudy: clear: aurora. 13. Fine: cloudy. 14. Clear : aurora. 15. Hazy: 

 aurora. 16. Fine: hazy: fine. 17. Fine. 18. Fine: cloudy. 19. Cloudy. 



20. Cloudy: drops. 21. Cloudy: rain. 22. Bright: rain. 23. Showers: cloudy. 

 24. Cloudy : clear. 25. Bright : clear. 26. Hazy : clear. 27. Bright : clear. 

 28. Rain : showers : aurora. 29. Bright : showers : clear : aurora. 30. Showers : 

 aurora. 



