Meteorological Observations. 79 



colouring matter (bresilein) and oxide of chromium ; when it is washed 

 with diluted hydrochloric acid, the colouring principle is dissolved, 

 and pure green oxide of chromium is left. 



When solution of ammonia is poured directly upon the crystals of 

 bresilin, they become immediately of a deep purple-red colour ; but 

 without the contact of air little change is produced. 



Potash and soda give with bresilin, in contact with air, the colour 

 of venous blood, which hydrochloric acid precipitates in an hour. 

 Lime water reddens the solution of bresilin ; nitrate of silver and 

 chloride of gold are reduced when boiled with bresilin, while acetate 

 of lead gives a whitish-yellow precipitate, becoming brown by dry- 

 ing. When decomposed by heat no traces of ammonia are per- 

 ceptible. 



100- 

 It will appear by calculation that the first of these substances is 

 converted into the second by absorbing two equivalents of oxygen 

 from the air. — Journ. de Ph. et de Ch., Mars 1844. 



METEOROLOGICAL. OBSERVATIONS FOR MAY 1844. 



Chiswick. — May 1. Dry haze: excessively dry : clear and fine. 2,3. Cloud- 

 less : excessively dry. 4. Slight rain. 5 — 7. Overcast and fine. 8. Dry haze. 

 9. Sultry. 10. Overcast; very fine. 11, 12. Very fine. 13. Sultry. 14, 15. 

 Very fine. 16. Cloudy and fine, 17. Cloudy and windy. 18,19. Boisterous. 



20. Boisterous: cold and dry. 21. Drizzly. 22. Dry haze s very fine. 23. 

 Cold haze. 24. Cloudy and cold: fine. 25. Overcast: fine: clear. 26,27. 

 Cloudy and cold. 28. Cloudy. 29. Overcast : slight drizzle : rain at night. 

 30. Cloudy. 31. Overcast: fine; clear. — Mean temperature of the month l°*2 

 below the average. 



Boston.— May 1—3. Fine. 4. Cloudy. 5 — 7. Fine. 8, 9. Cloudy. 10. 

 Cloudy: rain P.M. 11. Fine. 12. Cloudy. 13,14. Fine. 15. Cloudy. 16. 

 Fine. 17. Rain. 18. Cloudy: rain p.m., with rainbow. 19. Windy. 20,21. 

 Windy: rain P.M. 22,23. Cloudy. 24. Cloudy : rain p.m. 25— 31. Cloudy. 



Sandwich Manse, Orkney. — May 1. Bright: clear. 2. Bright : cloudy. 3. 

 Damp : clear. 4. Bright : clear. 5. Bright: cloudy, 6. Bright: rain. 7,8. 

 Bright: clear. 9. Damp: rain. 10. Drizzle: damp. 11, 12. Cloudy: clear. 

 13. Clear: showers, 14. Bright: cleared. 15. Cloudy. 16. Cloudy: showers. 

 17. Showers. 18. Clear: showers. 19. Bright: clear. 20. Bright: cloudy. 



21, 22. Bright: damp. 23. Cloudy. 24. Cloudy: clear, 25, Bright: clear. 

 26, 27, Bright: cloudy, 28, 29. Cloudy, 30, 31, Cloudy: damp. 



Apjilegart/i Manse, Dumfries-shire, — May 1 — 3. Fine, but parching. 4 — 6. 

 Very droughty. 7. One slight shower a.m. 8. Fair. 9, 10. Showers, slight. 

 11. Fair, but cloudyj 12, 13. Fair and clear. 14. Cool. 15 — 17. Fair and 

 withering, 18. Hoar-frost a.m. 19, 20. Fair and very dry. 21. Very high 

 wind. 22—28. Very withering. 29. Hoar-frost. 30, Hoar-frost : dry, 31. 

 A few drops of rain. 



