Meteorological Observations* 399 



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production of iodoform by the mutual reaction of iodine upon al- 

 cohol, under the influence of potash ; acetic aether only is formed. 



If, on the other hand, to an aqueous solution of carbonate of potash 

 there be added alcohol, iodide of potassium, and iodine in excess (the 

 alcohol not being sufficient to separate the saline solution), and the 

 mixture be exposed to a temperature of 140° Fahr., there is an abun- 

 dant production of iodoform in a few hours, iodine in excess always 

 remaining. 



M. Bouchardat observes, that it was long before he could account 

 for the difference of action under circumstances which appeared so 

 similar, for while with caustic potash acetic aether only was obtained, 

 whereas with the carbonate the product was iodoform ; it afterwards 

 appeared that as it was requisite to employ a temperature of 140° with 

 the carbonate of potash, whilst with the caustic potash it was only 

 about 60° to 68° Fahr., this difference might account for the dif- 

 ferent effects produced. To determine this a solution of iodine and 

 iodide of potassium in water and alcohol was heated to 140° Fahr., 

 and a solution of caustic potash was then added, in which the forma- 

 tion of iodoform immediately took place ; it is therefore evident that 

 the different reactions were occasioned by variations of temperature. 

 —Journal de Pharmacie et de Chimie, JuUlet, 1843. 



METEOROLOGICAL OBSERVATIONS FOR SEPT. 1843. 



Chisurick. — Sept. 1. Foggy: sultry. 2,3. Slight haze : sultry. 4. Clear and 

 fine. 5. Heavy dew : clear. 6. Cloudless. 7. Slight haze : cloudless and hot. 



8, 9. Very fine. 10. Foggy : heavy thunder-showers. 11. Very fine. 12. Over- 

 cast. IS. Clear and fine. 14. Overcast. 15 — 20. Exceedingly fine. 21. Foggy : 

 very fine. 22, 23. Clear and fine. 24, 25. Overcast. 26. Fine: clear and cool. 

 27. Cloudy and cool : clear, with slight frost at night. 28. Very clear : over- 

 cast. 29. Cold and dry : overcast. 30. Rain. — Mean temperature of the month 

 3°*81 above the average. 



Boston. — Sept. 1 — 6. Fine. 7. Fine: quarter-past 2 p.m. heat 77°. 8. Foggy. 



9. Cloudy. 10. Fine: rain p.m. 11, 12. Cloudy. 13— 15. Fine. 16. Cloudy. 

 17 — 19. Fine. 20. Cloudy : rain early a.m. 21,22. Fine. 23,24. Foggy. 



25. Cloudy : rain a.m. 26. Windy. 27. Cloudy. 28. Windy. 29. Cloudy. 

 30. Cloudy : rain early a.m. 



Sandwich Manse, Orkney. — Sept. 1. Clear. 2. Cloudy : showers. 3. Showers. 

 4. Showers: cloudy. 5. Damp : drizzle. 6. Damp: fine. 7—9. Clear: hot: 

 fine. 10. Damp. 11. Haze : fog. 12. Fine. 13. Haze: clear. 14. Clear. 

 15. Clear: cloudy. 16. Clear. 17. Cloudy: fine : damp. 18. Showers. 19. 

 Clear : aurora. 20. Rain. 21. Showers : cloudy. 22. Cloudy. 23. Damp i 

 drizzle. 24. Drizzle. 25. Showers : drizzle. 26. Bright : cloudy : aurora. 

 27. Showers. 28. Showers i cloudy. 29. Rain. 30. Cloudy : rain. 



Ajijtlegarth Manse, Dumfries-shire. — Sept. 1. Fair and fine: one slight shower. 

 2. Fair and fine. 3. Showery. 4, 5. Fine harvest-day. 6. Fine harvest-day : 

 one slight shower. 7. Fine harvest-day : fair. 8, 9. Fine harvest-days. 10. 

 Fine harvest-day, but cloudy. 11. Fine : shower early a.m. ;12, 13. Fine har- 

 vest-days. 14. Fine harvest-day : thunder. 15. Fine harvest-day. 16. Fine 

 harvest-day: sheet lightning. i7. Showery. 18. Fair and fine : thunder. 19. 

 Fair and fine. 20 — 24. Fine harvest-day. 25. Fine harvest-days : hoar-frost. 



26. Fine harvest-day ! no frost. 27. Fine harvest-day : hoar-frost. 28. Dull : 

 wet evening. 29. Cloudy : rain. 30. Cloudy. 



Sun shone out 28 days. Rain fell 7 days. Thunder 2 days. Hoar-frost 2 

 days. 



Calm 1 4 days. Moderate 9 days. Brisk 4 days. Strong breeze 3 days. 

 Mean temperature of the month 56°*3 



