Meteorological Observations. 289 



On a Migration of Dragon-fiies. By M. C. Morren. 

 In a short notice communicated to the Royal Society of Belgium, 

 M. Morren mentiops, that on the 1 6th of June last, at about four 

 o'clock in the afternoon, an immense swarm of dragon-flies was seen 

 at Hasseignies, in Hainault, flying towards the north-west. The 

 passage of these insects lasted for about three-quarters of an hour, 

 over a surface of at least three-quarters of a league. Those which flew 

 lowest were at a height of from 6 to 7 feet from the ground, but it 

 was impossible to judge of the elevation of the highest fliers. The 

 species was the common LibeUula depressa, Linn. No reason could 

 be ascertained for this extraordinary migration. — Bull, de V Acad. 

 Roy. de Belgique, 1853, pt. 2. p. 323. 



METEOROLOGICAL OBSERVATIONS FOR JAN. 1854. 



Chiswick. — January 1. Clear and frosty: snowing: frosty. 2. Frosty through- 

 out : severe frost at night. 3. Severe frost, with fog : overcast. 4. Overcast and 

 cold : snow 7 inches deep. 5. Thick haze : rain and sleet : 2 inches additional 

 depth of snow. 6. Hazy. 7. Heavy rain. 8. Clear and fine. 9. Rain : foggy : 

 rain at night. 10,11. Cloudy and cold. 12. Cloudy: shght rain. 13. Slight 

 haze: clear. 14. Clear: hazy. 15. Foggy: cloudy. 16. Dense fog : overcast, 

 17. Cloudy. 18. Densely clouded : overcast. 19. Dense fog. 20. Rain: over- 

 cast. 21. Fine : frosty. 22. Frosty haze : clear and fine : overcast : frosty. 23. 

 Foggy : very fine. 24. Cloudy and vdndy : rain : frosty. 25. Frosty : clear and 

 fine : cloudy. 26. Fine : very clear. 27. Densely overcast : rain. 28. Slight 

 rain : cloudy : clear. 29. Boisterous, with rain : overcast. 30. Cloudy and mild : 

 clear. 31. Overcast : cloudy. 



Mean temperature of the month ZV'i^ 



Mean temperature of January 1853 40*41 



Mean temperature of Jan. for the last twenty-eight years . 36 "68 

 Average amount of rain in Jan 1-74 inch- 



BosloH. — Jan. 1. Fine. 2. Cloudy: snow am. and p.m. 3. Cloudy: thermo* 

 meter at 8 a.m. 5°. 4. Stormy : snow-storm a.m. and p.m. 5. Cloudy. 6. 

 Cloudy : snow a.m. 7. Cloudy : rain p.m. 8. Cloudy : rain a.m. 9 — 13. Cloudy. 

 14. Fine. 15. Cloudy : rain early a.m. 16 — 19. Cloudv. 20. Cloudy : rain p.m. 

 21. Cloudv. 22, 23. Fine. 24. Cloudv : rain a.m. 25. Fine. 26. Fine : rain a.m. 

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



Sandwick Manse, Orkney. — Jan. 1. Snow-drift a.m. : snow-showers p.m. 2. 

 Bright A.M. : cloudy p.m. 3. Bright a.m. : snow-showers p.m. 4. Bright a.m. : 

 clear P.M. 5. Bright a.m. : snow-showers p.m. 6. Bright a.m. : clear p.m. 7, 

 Thaw a.m. : sleet and rain p.m. 8. Sleet-showers a.m. and p.m. 9. Bright, 

 frost a.m. : cloudy p.m. 10. Bright, frost a.m. : clear p.m. 11. Clear, frost am. : 

 clear P.M. 12. Snow-showers a.m. snow-drift, showers p.m. 13. Clear, fine a.m. 

 cloudy p.m. 14. Cloudy a.m. : clear, frost p.m. 15. Bright a.m. : clear, aurora 

 p.m. 16. Bright a.m. : rain p.m. 17. Cloudy a.m. : clear, aurora p.m. 18. Bright 

 a.m. : cloudy, aurora p.m. 19. Bright a.m. : cloudy p.m. 20. Bright a.m. : 

 cloudy, aurora p.m. 21, 22. Cloudy .\.m. and p.m. 23. Clear a.m. : cloudy, aurora 

 p.m. 24. Cloudy a.m. : clear p.m. 25. Cloudy a.m. : sleet-showers, lightning p.m. 

 26. Hail-showers a.m. : cloudy p.m. 27. Cloudy a.m. : showers p.m. 28. Showers 

 a.m. and p.m. 29. Showers a.m. : showers, aurora p.m. 30. Drizale a.m. : 

 drizzle, aurora p.m. 31. Showers a.m. : cloudy p.m. 



Mean temperature of Jan. for twenty-seven pre\ious years ... 38^*46 



Mean temperatuie of this month 36 -47 



Mean temperature of Jan. 18;)3 38 "55 



Average quantity of rain in Jan. for thirteen previous years . 4*35 inches. 



