Meteorological Observations. 543 



general results of which were the same : the numerical details of 

 these are reserved, however, until the experiments can be repeated 

 with a more delicate balance. 



The comparative cohesion of pure water and soap water was de- 

 termined by the weight necessary to detach the same plate from each; 

 and in all cases the pure water required the greater force. The want 

 of permanency in the bubble of i)ure water is therefore not due to 

 feeble attraction, but to the perfect mobility of the molecules, which 

 causes the equilibrium, as in the case of the arch without friction of 

 parts, to be destroyed by the slightest extraneous force. 



Several other experiments with films of soap water were also de- 

 scribed, which afford striking illustrations of the principles of capil- 

 larity, and which apparently have an important bearing on the whole 

 subject of cohesion. — Proceedings of the Amer. Pldl. Soc, vol. iv. 

 pp. 56, 84. 



METEOROLOGICAL OBSERVATIONS FOR APRIL 1845. 



Cfiiswick. — April 1. Slight liaEe : clear. 2, 3. Foggy : fine: clear. 4. Foggy S 

 cloudless. 5. Thick haze : fine. 6. Clear and fine ; sharp frost. 7. Clear and 

 frosty : very dry air : slight frost. 8. Densely overcast : cloudy : sharp frost. 

 9. Foggy: overcast. 10. Showery throughout. 11. Rain: dense clouds and 

 cold : frosty at night. 12. Cloudy and fine ; rain. 13. Showery : clear and fine. 



14. Boisterous. 15. Boisterous, with slight rain. 16. Overcast ; fine. 17. Fine. 

 18. Overcast: fine. 19. Overcast and cold : very fine. 20. Slight haze: very 

 fine. 21, 22. Very fine. 23. Sultry. 24—26. Very fine. 27. Showery. 28. 

 Overcast. 29. Very fine, 30. Overcast. — Mean temperature of the month 1° 

 above the average. 



Boston. — April 1. Cloudy. 9. — 5. Fine. 6. Fine: ice this morning. 7. 

 Cloudy. 8. Cloudy: rain a.m. 9. Fine. 10. Windy: rain p.m. 11. Windy j 

 rain A.M. 12. Cloudy. 13. Cloudy: rain p.m. 14. Windy: rain p.m. 15. 

 Cloudy and stormy: rain early a.m. 16. Cloudy. 17. P'ine. 18. Cloudy. 

 19 — 21. Fine. 22. Cloudy. 23—25. Fine. 26. Rain. 27. Cloudy. 28 — 

 30. Fine. 



Sandwich Manse, Orhiei/. — April 1. Bright: damp. 2. Bright: clear. 3, 

 4. Clear: cloudy. 5. Clear. 6. Fog: clear. 7,8. Bright: clear. 9. Rain; 

 cloudy. 10, 11. Blight: cloudy. 12, 13. Cloudy: clear. 14. Rain: clear. 



15. Clear. 16. Cloudy : drizzle. 17. Drizzle: fog. 1 8. Bright : fog. 19. Clear, 

 20, 21. Fine : clear : fine. 22. Fine. 23. Fine: fog. 24. Cloudy. 25. Bright : 

 cloudy. 26. Rain : damp. 27. Bright : cloudy. 28. Showers. 29. Bright : 

 clear. 30. Cloudy. 



Applegarlh Manse, Dtimfrus-shire. — April 1, 2. Fine : dry : hoar frost. 3. Re- 

 markably fine. 4. Very droughty : raw frost. 5. Very droughty, but milder. 

 6. Hoarfrost. 7. Slight frost. 8. Rain and hail. 9, Slight showers. 10. Fre- 

 quent showers. 11. Clear : fair, but cold. 12. Cloudy : tirops : rain. 13. Hail 

 and rain. 14. Slight showers. 15, Dry and cold. 16. Fair : fine : slight frost. 

 17. Very fine. 18. Fine. 19— 2iJ. Fine : droughty. 23, 24. Fine. 25. A few 

 drops : rain. 26. Heavy rain. 27. Heavy rain and flood. 28. Fair, but un- 

 settled. 29. Shower p.m. 30. Heavy rain p.m. 



