Meteorological Observations. 487 



fectly neutral, because the precipitate is soluble even in weak acid. 

 When heat is employed the precipitation takes place immediately. 



The ferrocyanides of calcium and magnesium being, as already 



stated, very soluble in vpater, it became important to determine the 



nature of the precipitated salts ; for this purpose a portion of the 



lime precipitate, which had been dried at 158° F., was treated with 



nitric acid and boiled in it till no trace of prussian blue remained ; 



the liquor being evaporated to dryness and the residue analysed in 



the usual way, gave as results that the salt of lime was composed of 



One atom of protocyanide of iron. . 669*12 or 27*75 



One ... cyanide of calcium .. 585*93 ... 24*25 



One ... cyanide of potassium . 819*83 ... 34 



Three ... water 337*44 .. . 14 



2412*32 100* 

 It results from this composition, that this salt is represented by 

 the formula (FeCy®, CaCy^ KCy^-f 3H'2 0), and may be considered 

 as a double ferrocyanide of potassium and calcium, or as a hydrated 

 triple cyanide of iron, calcium and potassium ; the salt is remark- 

 able on account of the cyanogen being combined in equal proportions, 

 and with equivalent quantities of potassium, calcium and iron, with 

 a quantity of water sufficient to convert the cyanides into hydro- 

 cyanates. — Journ. de Chim. Medicale, Octobre 1844. 



METEOROLOGICAL OBSERVATIONS FOR OCTOBER 1844. 



Chiswick. — October 1. Clear : cloudy. 2. Densely clouded : clear. 3. Over- 

 cast : boisterous. 4. Clear and very fine : cloudy. 5. Very fine : rain. 6. Over- 

 cast : clear and fine : overcast. 7. Very fine : frosty. 8. Foggy : very fine. 



9. Cloudy : boisterous at night. 10. Cloudy and mild : clear. 11. Heavy dew : 

 very fine, 12. Foggy : very fine : showery. 13. Overcast : lightning at night. 

 14. Showery: rain, 15. Heavy shower: constant heavy rain at night. 16. 

 Showery: clear and fine. 17, 18. Fine. 19. Slight haze : cloudy. 20, Fine. 

 21. Overcast: hazy. 22. Rain : cloudy : clear and frosty, 23, Dense fog : 

 showery. 24, Cloudy : heavy rain. 25, Rain : densely clouded. 26, 27. Over- 

 cast and fine. 28. Foggy. 29, Overcast: rain. 30. Drizzly : cold haze. 31. 

 Foggy : fine : clear, — Mean temperature of the month 0°'76 below the average. 



Boston. — Oct. 1. Fine. 2. Cloudy and stormy : rain early a.m. : rain a.m. 



3, Windy. 4. Fine, 5. Cloudy: rain p.m. 6 — 8, Fine. 9, Cloudy: rainA,M. 



10. Cloudy: rain p.m. 11, 12. Fine. 13, 14. Fine: rain p.m. 15, Cloudy: 

 rain P.M. 16. Cloudy, 17. Cloudy: rain p.m. 18. Cloudy, 19. Fine, 20. 

 Cloudy. 21. Cloudy: rain p.m. 22. Cloudy. 23. Foggy : beautiful halo round 

 the moon quarter past eight P.M. 24,25. Cloudy: rain p.m. 26. Rain, 27. 

 Cloudy. 28, Fine : rain p.m. 29. Fine. 30. Cloudy : rain a.m. 31. Fine. 



Sandwich Manse, Orkney. — Oct. 1 — 3. Showers. 4, 5. Bright : showers. 

 6. Shower : aurora : showers. 7. Bright : clear. 8. Cloudy : drops. 9. Cloudy. 

 10. Bright : cloudy. 11. Bright : clear. 12, 13. Bright : cloudy. 14. Drizzle, 

 damp. 15. Kain : cloudy. 16. Rain : showers. 17. Shower : rain. 18. Showers: 

 19. Frost : cloudy : shower. 20. Clear : fine: aurora. 21. Frost: fine. 22. 

 Clear. 23. Clear : cloudy. 24. Bright : clear. 25. Fine : clear : aurora. 26. 

 Fine: clear. 27. Cloudy. 28. Cloudy: clear. 29. Bright: clear. 30,31. 

 Cloudy. 



Apiilegarlh Manse, Dumfriesshire. — Oct. 1. Fair. 2, 3. High wind and rain. 



4. Rain p.m. 5. Fair, but cloudy. 6, Showers. 7. Fair and fine. 8. Fair, 

 but dull. 9. High wind and rain. 10, 11. Showers. 12. Rain a.m. 13. 

 Cloudy and threatening. 14. Showery. 15—17. Fair and fine. 18. Fairand 

 fine: frost P.M. 19, 20. Showers]: thunder: hail. 21. Fair and fine : frost. 22 — 

 24. Fair and fine. 25. Showery. 26. Fair and fine. 27, 28. Fair, but cloudy : 

 frost. 29. Slight rain. 30. Rain p.m. 31. Fair, but cloudy. 



