Meteorological Observations. 399 



"to 



ticulars cane-sugar altered by acids, but is distinguished from it 

 in possessing a much stronger rotary power towards the left. The 

 absolute rotary power of liquid sugar of honey at the temperature of 

 55° F. for the red ray, and at the length of 100 millims., was found 

 to be equal — 33*103 towards the left; whilst that of altered 

 sugar under similar circumstances was found to be equal only to 

 — 1 8" 933 . The liquid sugar of honey retains its rotary power towards 

 the left even after it has been rendered solid ; it is one of the few sub- 

 stances which possess this character. The third sugar which con- 

 stitutes part of honey is distinguished from granular sugar in being 

 unalterable by acids, and from liquid sugar in rotating towards the 

 right. Its proportion is considerable in honey from the comb, di- 

 minishes by keeping, and even entirely ceases to exist in solidified 

 honey. — L'Institut, Juin 11, 1849. 



METEOROLOGICAL OBSERVATIONS FOR SEPT. 1849. 



Chiswick. — September 1. Heavy rain: lightning, with fine rain 10 p.m. 2. Fine: 

 thunder and lightning, with rain 8 p.m.^ 3. Very fine : lightning, with rain at 

 night. 4, Fine : cloudy : very clear at night. 5. Hazy : very fine : clear. 6. 

 Clear and very fine. 7. Cloudy : very fine : cloudy. 8,9. Fine. 10. Cloudy: 

 heavy showers in the evening. 11. Hazy: very fine : clear. 12. Heavy rain. 

 13. Overcast : rain : clear. 14 — 16, Fine. 17. Clear and fine. 18. Clear and 

 cold : cloudy. 19. Very fine. 20. Fine. 21. Showery : fine. 22. Fine. 23. 

 Dusky haze. 24. Foggy : very fine : clear. 25. Foggy : exceedingly fine. 

 26. Foggy : fine : clear. 27. Fine : rain at night. 28. Clear : very fine : over- 

 cast. 29. Overcast : fine : heavy rain. 30. Rain. 



iVlean temperature of the month 57°*76 



Mean temperature of Sept, 1848 .> 55 '96 



Mean temperature of Sept. for the last twenty-three years 57 '23 



Average amount of rain in Sept 2*73 inches. 



Boston. — Sept. 1. Cloudy : rain p.m. 2. Cloudy : rain early a.m., with thunder 

 and lightning. 3. Fine : rain early a.m., with thunder and lightning. 4. Cloudy. 

 5. Fine. 6. Fine : rain p.m. 7,8. Cloudy. 9. Fine. 10. Cloudy : rain a.m. 

 and P.M. 11. Cloudy. 12. Cloudy : rain a.m. and p.m. 13. Rain : rain a.m. 

 14,15. Cloudy. 16. Fine: rain a.m. 17 — 20, Fine. 21. Fine : rain and hail 

 early a.m. 22, 23. Fine. 24. Cloudy. 25 — 27. Fine. 28. Rain : rain a.m. 



29, 30. Rain a.m. and p.m. 



Applegarlh Manse, Dumfries-shire. — Sept. 1. Dull a.m. : cleared : fine harvest 

 day. 2. Hail : thunder : rain a.m. : fine p.m. 3. Dew-like shower a.m. : fine: 

 sultry. 4, 5. Beautiful harvest day : sultry p.m. 6 — 8. Fine. 9. Showery all 

 day. 10. Very wet a.m. : cleared and fine p.m. 11. Fair a.m.: shower p.m. 

 and thunder. 12. Fair : dull p.m. 13. Fair: high wind. 14. Dull and threaten- 

 ing rain, but cleared and was fine. 1 5. A shower : looking unsettled. 1 6. Heavy 

 rain early A.M. : thunder. 17,18. Fine: very beautiful day. 19,20. Fine: 

 cloudy : fine harvest day. 21. Fine : cloudy ; bar. falling. 22. Fair still. 23 — 

 26. Fair. 27. Fair : clear and cold. 28. Rain nearly all day. 29. Rain. 



30. Storm of wind and rain. 



Mean temperature of the month 53°*5 



Mean temperature of Sept. 1848 53 "1 



Mean temperature of Sept. for the last twenty-five years . 53 -O 

 Average amount of rain in Sept. for the last twenty years 3"13 inches. 

 Sandwick Manse, Orkney. — Sept. 1. Cloudy: drops. 2. Damp. 3, 4. Fog. 

 5. Bright : cloudy. 6. Cloudy. 7. Clear. 8. Bright : cloudy. 9. Bright : 

 rain : aurora. 10. Bright : clear : aurora. 1 1. Cloudy : rain : aurora. 12. Rain : 

 drizzle. 13. Rain : clear : aurora. 14. Bright : showers. 15. Cloudy : clear : 

 showers. 16. Showers : aurora. 17. Clear : cloudy. 18. Cloudy: rain. 19. 

 Clear: cloudy. 20. Cloudy: fine: cloudy. 21. Fine: cloudy. 22. Damp: 

 cloudy. 23. Bright : cloudy. 24. Cloudy. 25 — 27. Bright : cloudy. 28. 

 Cloudy : damp. 29. Bright : cloudy. 30. Bright : drops : clear. 



