Meteoroloyicul Obscnatiuns. 143 



On the origin of tlie North of Enghind coal-field. 



On the cause of the crystalline structure of the magnesian lime- 

 stone of Sunderland. 



On the various systems which have been adopted in classifying the 

 Animal Kingdom. The principles of the Chronogcnlc classification ?i% 

 aj)j)lied bv the lecturer to the Tetrabranchiate Cejihalopods*. Reptiles 

 and Mammals in 1841. 



An outline of the Comparative Histology of Plants. On the vege- 

 tation of the various geological periods. 



An outline of the science of Conchology. On the Testaceous 

 Mollusks of the various geological periods. The Tetrabranchiate 

 Cej halopodous type traced throughout its principal generic modifi- 

 cations. 



An attempt to graduate the principal reptilian and mammalian 

 groups of the various geological periods into existing forms according 

 to the principles of the chronogenic classification. 



The work will be illustrated with numerous diagrams and figures ; 

 and it is intended to j)ublish it by subscription. 



METEOROLOGICAL OBSERVATIONS FOR DEC. 1844. 



Chiswick. — Dtcember 1 — 3. Overcast. 4. Cloudy and cold : sharp frost. 

 5. Frosty : severe frost at night, 6. Frosty and foggy : severe frost. 7. Hazy: 

 slight frost. 8. Dry and frosty : sleet. 9. Overcast, 10. Cold and dry. 11. 

 Dusky haze : clear and frosty. I'i. Foggy : overcast. 13. Thick haze : overcast. 

 14. Hazy : densely overcast. 15. Slight thaw : foggy. 16. Foggy, 17. Dense 

 fog. 18. Foggy: fine at night. 19. Drizzly: boisterous. 20. Overcast: clear 

 and cold : boisterous. 'Jl, '22. Cold and dry : overcast. 23. Overcast. 24. Hazy 

 and cold. £5. Overcast. 26, 27. Dense fog. 28. Fine : overcast. 29. Drizzly : 

 rain. SO. Foggy. 51. Hazy. — Mean temperature of the month 6'"8 below the 

 average. 



Boston. — Dec. 1. Cloudy. 2. Cloudy: very dark day. 3. Cloudy: rain 

 early a.m. 4. Cloudy. 5, 6. Fine. 7. Cloudy. 8. Fine : snow p.m. 9 — 16, 

 Cloudy. 17. Foggy : rain early A.M. 18. Rain : rain p.m. 19. Cloudy. 20 — 

 22. Fine. 23—25. Cloudy. 26—30. Foggy. 31, Foggy : rain early a.m. 



Sandwich Mniise, Orkney. — Dec, 1. Bright: cloudy. 2. Cloudy: drops. 3. 

 Cloudy. 4. Bright : clear, 5, Bright : cloudy. 6, Bright : frost : cloudy : frost. 

 7,8, Bright : frost : hazy. 9. Showers. 10, 11. Showers : sleet. 12. Cloudy: 

 showers. 13 — 15. Snow-showers. 16, 17. Showers. 18. Showers : clear: frost, 

 19. Clear : frost : clear: showers. 20. Bright : clear : frost. 21. Clear: frost. 

 22. Frost: clear: thaw, 23, Cloudy: thaw. 24. Cloudy. 25. Cloudy: showers. 

 26. Cloudy : frost : cloudy. 27, Cloudy : frost : clear. 28. Cloudy : damp. 

 29. Fog: damp. 30, Bright : cloudy. 31, Showers: cloudy. 



Apptegarth Manse, Dumfries-shire. — Dec, 1. Fair, but cloudy. 2,3. Fair and 

 mild. 4 — 11, Frost, 12. Frost: slight fall of snow, 13, Frost, 14, 15. Frost: 

 cloudy. 16. Frost : very slight. 17. No frost. 18. No frost : rain. 19 — 21. 

 Frost, 22, Frost : very mild. 23 — 26, Frost. 27. Frost : mild and fine. 28. 

 Frost A.M. : rain P.M. 29. Thick fog. 30. Frost: shower p.m. 31. Frost: fog. 



Mean temperature of the month 33°*8 



]\Iean temperature of Dec. 1843 46 '4 



Highest temperature 27tli day 43 "5 



Lowest temperature 20ih day 20 "0 



Mean temperature of spring-water 43 "6 



Mean temperature of ditto Dec. 1843 ... 46 •! 



• Vide Annals of Nat. Hist. Oct. 1844, 



