Meteorological Observations. 239 



anuret of potassium with sulphur, the sulphocyanuret of potassium, 

 and sulphocyanuret of iron, are formed ; 4 eq. of the latter decom- 

 pose into 4 eq. sulphuret of iron 4 Fe S, 2 eq. sulphuret of carbon 

 2 CS 2 , and 1 eq. of mellon, which as soon as it is formed decomposes 

 1 eq. of sulphocyanuret of potassium into mellonuret of potassium 

 and sulphocymnogen ; the latter is further decomposed into sulphur, 

 sulphuret of carbon, and mellon. 



Formula K + C 6 N 4 ; eq. = 132'47. Turner's Elements of Che- 

 mistry, pp. 797, 798. 



CYANILIC ACID. 



By a long-continued boiling of mellon in dilute nitric acid, a so- 

 lution is effected with the evolution of gaseous products, and the 

 liquid yields on evaporation colourless, transparent, octohedral cry- 

 stals ; by re-solution in hot water, hydrated cyanilic acid in soft tabu- 

 lar crystals of a mother-of-pearl lustre are obtained. This acid has 

 the same composition as the crystalline cyanuric acid ; contains, like 

 the latter, 4 eq. water of crystallization, which it loses at 2 1 2, when 

 it becomes opake and falls to a white powder. By the destructive 

 distillation it is converted into hydrated cyanic acid ; by solution in 

 sulphuric acid and caustic potassa into cyanuric acid. This acid 

 has been but little examined. Its formation admits of explanation 

 on the supposition that the elements of 1 eq. of mellon and 3 eq. of 

 water give rise to 1 eq. cyanilic acid and 1 eq. ammonia, and the 

 latter is in point of fact found combined with the nitric acid ; ac- 

 cording to this, its formation ought not to be dependent on the use 

 of nitric acid alone. Ibid. p. 798. 



METEOROLOGICAL OBSERVATIONS FOR JULY, 1840. 



Chiawick. July 1. Overcast: boisterous. 2. Rain, with strong wind. 3. 

 Cloudy and fine. 4. Very fine. 5. Cloudy: windy. 6, 7. Fine. 8. Fine: 

 heavy rain. 9 12. Very fine. 13 17. Fine. 18. Overcast. 19. Cloudy: 

 rain. 20. Heavy showers. 21. Very fine : rain. 22. Fine. 23. Cloudy. 

 24. Overcast and fine: rain. 25. Showery. 26. Cloudy: fine. 27. Fine. 

 28. Hazy. 29. Very fine. 30. Cloudy: rain. 31. Very fine. 



Boston. July 1,2. Rain. 3. Stormy. 4. Fine: rain early A.M. : rain A.M. 

 5. Fine: rain A.M. 6. Cloudy: rain P.M. 7. Cloudy: rain early A.M. : rain 

 P.M. 8. Cloudy: rain P.M. 9. Cloudy. 10. Cloudy: rain P.M. 11 13. 

 Cloudy : rain A.M. and P.M. 14, 15. Fine. 16. Rain : rain early A.M. 17. 

 Fine. 18,19. Cloudy: rain P.M. 20. Fine. 21. Fine: rain P.M. 22. Fine. 

 23,24. Cloudy. 25. Rain : thunder and lightning with rain P.M. 26. Cloudy. 

 27. Fine. 28. Cloudy: rain A.M. 29. Fine. 30. Cloudy. 31. Fine. 



Applegarth Manse, Dumfries-shire. July 1. Heavy rain A.M. : cleared up P.M. 

 2. Drizzling all day. 3. Heavy rain all day. 4. Fair till 4 P.M. then wet. 5. 

 Showery : fair evening. 6. Rainy. 7, 8. Showery : thunder. 9. Fair all day. 

 10. Showery. 11. Warm : a single shower : thunder. 12. Very wet. 13. Fine 

 dry day. 14. Wet afternoon. 15. Very wet all day. 16, 17. Occasional showers. 

 18. Fair till afternoon, then wet. 19. Rain early A.M. : cleared up. 20. Fair all 

 day. 21. Heavy showers all day : thunder. 22. Fair all day. 23. Fair till 

 evening, then rain. 24. Showery all day. 25. Showery afternoon. 26 30. 

 Fair all day. 31. The same : a few drops P.M. 



Sun shone out 29 days. Rain fell 22 days. Thunder 3 days. 



Wind north day. North-north-east day. East- north-east 1 day. East 

 1 day. South-east | day. South 4 days. South-west 8 days. West-south-west 

 3 days. West 7 days. North-west 2 days. North-north-west 3 days. 



Calm 1 1 days. Moderate 12 days. Brisk 4 days. Strong breeze 2 days. 

 Boisterous 1 day. Variable 1 day. 



