Meteorological Observations. 159 



some Mollusks and intestinal worms ; it may be seen plainly in Beroe. 

 Prof. Agassiz thinks that the embryological development of the higher 

 animals shows a similar succession in the circulating function. He 

 also examined the connection of respiration with the circulation : in 

 Vertebrata, the gills are found between branches of the blood system ; 

 in Invertebrata, the chyhferous system is acted on by the respiration ; 

 the gills of fishes, then, cannot be compared to the gills of Crustacea, 

 Artieulata and Mollusks. No gills are connected mth the chymi- 

 ferous circulation ; animals having this circulation have no true respi- 

 ration ; they have only tubes to distribute freely aerated water to the 

 different parts of the body. — SillimarCs American Journal for July 



1850. 



METEOROLOGICAL OBSERVATIONS FOR DEC. 1850. 

 Chiswick. — December 1. Slight haze: overcast: drizzly rain. 2,3. Overcast. 

 4—6. Foggy. 7. FofTgy : fine : dense fog. 8. Foggy. 9. Foggy : slight fog 

 at night. 10. Foggy. II. Foggy: overcast. 12. Rain: cloudy and fine: 

 foggy. 13. Very dense fog : cloudy and fine, 14. Clear: boisterous, with rain. 

 15. Overcast . slight rain : warmer at night than at noon. 16. Clear : overcast . 

 squally. 17. Clear : rain. ] 8. Frosty : fine : rain. 1 9. Foggy : overcast : clear. 

 20. Frosty : fine : frosty. 21. Frosty and foggy : slightrain at night. 22. Frosty : 

 fine : foggy. 23. Frosty and foggy : hazy : foggy. 24. Hazy : foggy : overcast. 

 25. Clear and very fine. 26. Hazy. 27. Overcast : exceedingly fine : overcast. 

 28. Clear: very fine. 29. Fine. 30. Fine: cloudy: overcast. 31. Overcast: 

 rain : drizzly. 



Mean temperature of the month 38''*47 



Mean temperature of Dec. 1849 37 '17 



Mean temperature of Dec. for the last twenty-four years ... 39 -85 



Average amount of rain in Dec 1'58 inch. 



Boston. — Dec. 1. Fine. 2,3. Cloudy. 4. Cloudy: rain a.m. and p.m. 5. 

 Cloudy. 6. Fine. 7.8. Cloudy. 9. Foggy. 10—12. Cloudy. 13. Foggy. 

 14. Fine : rain and hail P.M. 15. Cloudy : rain p.m. 16,17. Fine: rain p.m. 

 18. Fine. 19. Rain : rain a.m. 20—23. Fine. 24. Cloudy. 25. Fine. 26. 

 Cloudy : rain a.m. and P..1I. 27 — 31. Cloudy. 



Apptegarlk Manse, Dumfries-shire, — Dec. 1. Frost, hard : cloudy p.m. 2. Rain 

 and high winds all (lay. 3. Dull and moist: rain preceding night. 4. Mild: 

 rain heavy a.m. : fog. 5. Wet, though not heavily, all day. 6. Fair .and fine : 

 moist P.M. 7. Frost A.M. : fog p.m. 8. Frost : fog all day. 9. Frost, hard : 

 clear and sharp. 10. Frost hard: barometer falling. 11. Fair a.m. : rain at 

 noon. 12. Fair and clear. 13. Heavy rain and high wind. 14. Heavy rain : 

 boisterous. 15. Fair, but cloudy and threatening. 16. Occasional dropping. 

 17. Moist : snow on the hills. 18. Frost keen : snow on the hills. 19, 20. Frost 

 hard. 21. Rain for twelve hours : cleared p.m. 22. Frost, raw : cloudy. 23. 

 Fair, but cloudy : shower p.m. 24. Rain : high wind p.m. 25. Fair and tem- 

 perate : wind strong. 26. Fair: preceding night wet. 27. Fair a.m. : shower p.m. 

 28. Fair and drying. 29. Drizzling all day. 30. Rain very heavy. 31. Con- 

 tinued rain and high wind. 



Mean temperature of the month S9°'5 



Mean temperature of Dec. 1849 37 -1 



Mean temperature of Dec. for twenty-eight years 38 "3 



Rain in Dec. 1849 4-20 inches. 



Sandwich Manse, Orhnei/. — Dec. 1. Clear: hazy. 2. Rain: clear: aurora, 

 3, 4. Clear. 5. Cloudy : rain. 6. Cloudy : clear : aurora. 7. Fine. 8. Fine : 

 hoar-frost: fine: aurora. 9. Fog: clear. 10. Bright: drops. 11. Cloudy: 

 drops. 12. Bright: showers. 13. Cloudy: clear. 14. Clear: cloudy. 15. 

 Bright : showers. 16. Showers: clear. 17. Sleet-showers. 18. Frost: clear: 

 frost. 19. Showers : clear : frost. 20. Frost : rain. 21. Showers. 22. Hazy. 

 23. Hazy: damp. 24. Cloudy: fine: showers. 25. Showers : cloudy. 26. 

 Drizzle. 27, 28. Sleet-showers. 29. Cloudy : damp. 30. Showers : clear : 

 showers. 31. Cloudv : showers. 



