Meteorological Observations. 223 



ON CHROIIATE OF CHROMIUM. 



M. C. Rammelsberg states that when a solution of chrome-alum 

 is mixed with one of neutral chromate of potash, the first portions 

 produce a red brown colour ; afterwards a brown precipitate is 

 formed, on the surface of which a very yellow liquid floats. 



This precipitate dissolves in hydrochloric acid with a yellowish- 

 green colour ; ammonia precipitates oxide of chromium, leaving 

 chromic acid in solution. When digested with potash, it readily 

 yields chromate of potash and oxide of chromium. 



M. Rammelsberg gives the annexed formula [3 Cr^ O', 2Cr- O', 

 9H- O]. — Journ. de Pharm. et de Ch., Novembre 1846. 



METEOROLOGICAL OBSERVATIONS FOR JAN. 1847. 



Cliiswkk. — January I. Frosty : overcast. 2. Hazy and cold. 3. Dry haze : 

 snow at night. 4. Cloudy. 5. Hazy. 6, 7. Foggy. 8. Hazy. 9. Cold : 

 hazy. 10. Sharp frost at night. 11. Frosty : fine : sharp frost. I'i, 13. Foggy. 



14. Sharp frost : foggy : frosty. 15, 16. Dense fog : frosty at nights. 17. Ury 

 haze : foggy. 18. Cloudy and cold. 19. Overcast: hazy. 20. Slight haze : 

 snow at night. 21. Snowing. 22. Den^e fog throughout. 23. Slight fog : 

 cloudy : rain. 24. Densely clouded : rain : clear. 25. Fine : slight showers in 

 the evening. 26. Partially overcast : fine : boisterous at night. 27. Clear : rain 

 at night. 28. Boisterous : clear and frosty. 29. Fine, with sun : clear and 

 frosty. 30. Clear and frosty : fine: densely overcast. 31. Light haze: cloudy : fine. 



JNIean temperature of the month 34°*26 



INIean temperature of Jan. 1846 43 '54 



Mean temperature of Jan. for the last twenty years ... 36 "81 



Average amount of rain in Jan 1'60 inch. 



Boston. — Jan. 1. Foggy: snow on the ground. 2,3. Cloudy. 4. Cloudy: 



snow early A.M. 5. Cloudy: rain early a.m. 6. Cloudy. 7. Rain. 8 — 11. 



Cloudy. 12. Cloudy: rain P.M. 13. Cloudy. 14 — 16. Fine. 17 — 20. Cloudy. 



21. Cloudy : snow P.M. 22. Cloudy : snow on the ground. 23. Cloudy. 24. 



Cloudy : snow nearly all melted. 25. Fine : rain midday. 26. Fine. 27. Windy. 



28. Rain. 29 — 31 . Fine. — This January has been the coldest since January 1842, 



and the driest since 1833. 



Sandwick Manse, Orkney. — Jan. 1. Fog. 2. Cloudy. 3. Damp : showers. 



4. Showers. 5. Showers : rain. 6, 7. Damp. 8. Cloudy. 9. Bright : clear. 

 10 — 12. Bright: frost: clear. 13. Bright: clear. 14. Bright: frost: clear. 



15. Bright : clear. 16. Drops : cloudy. 17 — 19. Cloudy : clear ; aurora. 20. 

 Fine: frost: clear: frost: aurora. 21. .Sleet-showers. 22. Bright: clear. 



23, 24. Cloudy: rain. 25 — 27. Bright : clear. 28. Clear : frost : cloudy. 29. 

 Bright: clear. 30. Bright: snow-showers: aurora. 31. Hail-showers: snow- 

 showers: aurora. 



Applegarth Afanse, Dumfries-shire. — Jan. 1. Clear, but moist. 2. Dull and 

 raw : slight snow. 3. Slight frost: very chilly. 4. Dull : slight frost : rain p.m. 



5. Dull : rain. 6. Fine and fair. 7, 8. Fair, but cloudy. 9, 10. Frost : clear. 

 11 — 13. Frost, hard. 14. Frost, hard, but cloudy. 15. Thaw. 16. Thaw: 

 drizzle. 17 — 21. Frost again. 22. Frost: snow: thaw. 23. Thaw: sleet. 



24. Heavy rain. 25. Slight frost a.m. : rain. 26. Heavy rain. 27. Rain: 

 cleared p.m. 28. Fair, but dull. 29. Slight frost a.m. 30. Slight frost a.m. : 

 cloudy. 31. Hard frost : snow p.m. 



Mean temperature of the month 35°'97 



Mean temperature of Jan. 1846 43 "0 



Mean temperature of Jan. for 25 years 34 '9 



Mean rain in Jan. for 20 years 2'60 inches. 



