Meteorological Observations. 351 



it a double salt, in which, contrary to what usually happens, the pot- 

 ash is isomorphous with soda. 



'I'Tie double sulphate of potash and soda is produced, not only by 

 fusing the two mixed sulphates, but by fusing sulphate of potash with 

 chloride of sodium, or carbonate of soda, or chloride of potassium with 

 sulphate of soda. 



Equivalents of neutral chromate of potash and anliydrous sulphate 

 of soda, exhibited after fusion the same phsenomena as the compound 

 of the two sulphates ; the crystals formed were composed of the two 

 acids and two bases. 



Tlie double chromate of potash and soda, free from sulphate, ex- 

 hibit very Hvely phosphorescence, and so also does the seleniate of 

 potash and soda. 



llie light which appears during the crystallization of certain bo- 

 dies is due, as proved by the foregoing statements in the opinion of 

 the author, to the passage of a salt from one state to another isomeric 

 with it. These transitions are very often accompanied with phseno- 

 mena, which appear of the same nature as phosphorescence, during 

 the crystallization of some salts ; among the most common may be 

 cited the sudden incandescence of oxide of chromium, titanic acid, 

 &c. — Journal de Pharm. et de Chim., January 1842. 



METEOROLOGICAL OBSERVATIONS FOR FEB. 1842. 



CItiswick. — February 1. Overcast: very fine : clear. 2. Very fine: slight rain 

 in the evening. 3. Slight haze. 4. Calm with slight haze. 5. Hazy. 6. Dry 

 haze: fine. 7. Sleet. 8. Foggy. 9. Overcast: fine. 10. Slight haze. 11, 

 12. Cloudy. 13. Clear and fine. 14— 16. Very fine. 17. Foggy. 18. Clear 

 and fine. 19. Frosty and foggy. £0. Drizzly. 21. Overcast : clear. 22. 

 Drizzly : cloudy. 23. Thickly overcast : cloudy : rain. 24. Cloudy. 95. Cold 

 rain : showery. 26. Showery : clear and cold. 27. .Stormy showers : heavy 

 rain : densely overcast. 28. Fine : overcast : stormy at night. 



Boston. — Feb. 1. Fine: rain early a.m. 2, 3. Fine. 4. Foggy. 5, 6. Cloudy. 

 7. Cloudy : snow a.m. : rain p.m. 8. Cloudy : rain p.m. 9. Foggy. 10. Cloudy. 

 II. Fine: rain P.M. 12. Cloudy. 13— 16. Fine. 17, 18. Cloudy. 19. Foggy. 

 20. Fine. 21. Cloudy: rain a.m. and p.m. 22. Fine. 23. Cloudy: rain p.m. 

 24. Rain. 25. Rain: rain early a.m. : snow a.m. 26. Cloudy: snow early a.m. 

 27. Cloudy: rain a.m. 28. Stormy. 



.Siiiidivich Manse, Orhiici/. — Feb. 1. Cloudy: showers. 2. Showers: aurora. 

 3. Cloudy : clear. 4, 5. Fine. 6. Damp ; frost. 7. Frost : aurora. 8. Frost : 

 cloudy. 9, lO. Clear: rain. 11. Clear: showery. 12. Showery. 13. Clear: 

 cloudy. 14. Cloudy : aurora. 15. Showers: aurora. 16. Cloudy. 17. Fine. 

 1 8. Cloudy : showers. 19. Cloudy: rain. 20. Showers. 21. Clear. 22. Clear : 

 cloudy. 23. Cloudy. 24. Clear: cloudy. 25. Clear. 26, 27. Frost: sleet- 

 showers. 28. Showers. 



Apiilenarlh Manse, Dumfriesshire. — Feb. 1, 2. Fine: thaw. 3. Frost a.m. : 

 fog p.m. 4. Thaw and slight rain a.m. 5. Frost : fine. 6. Dull and cloudy, 

 but freezing. 7. Frost : still dull. 8. Frost : clear. 9. Thaw and heavy rain 

 p.m. 10. Wet morning : blew strong. 11,12. Very wet and stormy. l;j. Wet. 

 14. Slight showers. 15. Slight showers : cleared i-.m. 16. Frost a.m. ; fair all 

 day. 17. Dull and moist. 18, 19. Fine and fair. 20. Fine and fair, but hjwh 

 wind. 21 — 23. Ruin a.m. : cleared. 24. Frost a..m. ; fine. 25. Wet a.m.: 

 cleared r m. 26. Hain p,3i. 27. Snow, hail, rain and wind. 28. Rain. 



Sun shone out 24 days. Rain fell 15 days. Frost 7 days. Snow and hail 1 

 day. Fog 1 day. 



Wind north-nortli-east 1 day. East-north-east 1 dny. East 3 days. East- 

 south-east 3 days. South 4 days. South-south-west 7 days. South-west 4 days. 

 West-south-west 1 day. West 5 days. 



