Meteorological Observations. 415 



cury with conia is insoluble in water, alcohol or sether ; the compound 

 is white, pulverulent, and decomposes at 21 2° Fahr., becoming yellow. 

 If to an aqueous solution of conia one of sulphate of alumina be 

 added, crystals are gradually formed, which with the microscope are 

 easily seen to be octohedrons. These crystals, when they have been 

 carefully washed, blacken if heated on platina foil. — Ibid. 



mr. luke Howard's cycle of eighteen years in the 



seasons of britain. 

 The readers of the Philosophical Magazine will doubtless learn 

 with pleasure that the cycle shows well this year to the end of Sep- 

 tember, viz. — 



1842. Nine months rain 17'35 inch. 



1824. The same 18-68 inch. 



So that we are 1*33 inch. 



(only) in arrear for rain. 



1842. Average temperature of nine months 50" 86° 



1824. The same 49*95 



So that we appear to have of heat in advance . . O^l 

 The Villa, Ackworth, Sept. 7, 1842. Luke Howard. 



METEOROLOGICAL OBSERVATIONS FOR SEPTEMBER 1842. 

 Chiswick. — September 1. Constant rain : temperature increasing towards night. 

 2. Overcast : sultry. 3. Overcast : clear. 4. Cloudy and fine. 5. Foggy : very 

 fine. 6. Very fine : clear. 7. Slight fog : fine. 7 — 10. p.m. violent thunder- 

 storm, much sheet- and sometimes forked lightning : heavy rain, with some hail : 

 clear at night. 8. Boisterous, with heavy rain. 9. Rain : cloudy. 10. Show- 

 ery. 11 — 15. Very fine. 16. Foggy : fine. 17- Cloudy: rain. 18. Fine, with 

 slight haze : rain. 19. Cloudy : showers. 20. Showery. 21. Cloudy and fine : 

 clear. 22. Foggy : cloudy and fine : slight rain. 23. Overcast : heavy rain. 

 24. Rain : overcast. 25. Slight showers : stormy, with rain at night. 26. Heavy 

 clouds and showers : clear. 27. Overcast : stormy and wet. 28. Fine. 29. 

 Clear : boisterous, with rain. 30. Clear and fine : slight rain. Mean tempera- 

 ture of the month 0*47° above the average. 



Boston. — Sept. 1. Cloudy : rain early a.m. 2 — 5. Fine. 6. Cloudy. 7. Fine: 

 rain, with thunder and lightning at night. 8. Cloudy. 9. Cloudy: rain early a.m. : 

 rain p.m. 10. Cloudy : rain early a.m. : rain p.m., with thunder and lightning. 

 11. Cloudy. 12. Cloudy: rain early a.m. 13. Fine. 14—16. Cloudy. 17. 

 Fine: rain p.m. 18, 19. Cloudy: rain early a.m. 20. Fine. 21 Cloudy. 

 22. Rain. 23. Rain : rain early a.m. : rain p.m. 24. Fine. 25. Cloudy : rain 

 early a.m. 26, 27. Cloudy. 28. Stormy : rain early a.m. 29. Rain and stormy : 

 rain early a.m. 30. Cloudy: rain early a.m. 



Sandwich Manse, Orkney. — Sept. 1 — 3. Showers. 4. Showers: cloudy. 5. 

 Bright: rain. 6. Rain : clear. 7. Damp: cloudy. 8. Rain. 9. Cloudy: 

 rain. 10. Clear : aurora. 11. Bright : fog. 12. Bright : cloudy. 13. Drizzle : 

 cloudy. 14, 15. Bright: cloudy. 16. Cloudy: drops. 17. Cloudy : clear. 

 18. Bright: clear. 19. Cloudy: rain. 20. Cloudy. 21. Rain: clear. 22. 

 Rain : drizzle. 23. Damp : dri/zle. . 24. Cloudy. 25. Bright : cloudy. 26. 

 Cloudy: showers. 27. Bright : cloudy. 28,29. Cloudy: clear. 30. Cloudy. 

 Applegarth Manse, Dumfries-shire. — Sept. 1. Very wet morning. 2. Fair but 

 cloudy. 3. Rain p.m. 4. Fine and fair. 5. Thick : rain p.m. 6. Fair but 

 cloudy. 7. Fair and fine. S. Heavy rain early a.m. 14. Cloudy and moist. 

 15, 16. Fair but cloudy. 17. Rain a.m. 18. Fair and fine : lightning. 19. 

 Fair and fine : thunder. 20. Fair and fine. 21. Fair and fine : thunder. 22. 

 Fair and fine till p.m. : rain. 23. Rain early a.m. 24. Rain. 25 — 28. Fair 

 and cool. 29. Fair and cool : a few drops. 30. Fair and cool. 



