Meteorological Observations, 159 



deprived, and which causes a proportionable diminution in its power 

 of condensation. 



These experiments require particular care, and can only be re- 

 produced with very accurate apparatus ; we will, however, describe 

 one which anyone may repeat without difficulty, and which will 

 exhibit our results in a conclusive manner. 



A fine powder (pounded glass or oxide of zinc) is mixed in a 

 mortar with water which has been deprived of air, so as to form a 

 clear paste without any bubbles of gas ; this is poured into a flask 

 with a long neck until it fills two-thirds of the bulb. After a short 

 time the solid substance is deposited with a layer of water above it. 

 A vacuum is then produced in the flask ; at the first strokes of the 

 piston the water rises, increases in volume so as to fill the flask, but 

 no bubble of air makes its appearance ; and if the cock of the air- 

 pump be suddenly opened, the pressure is reproduced, and the fluid 

 returns to its original volume with a rapidity which shakes the flask, 

 and a sound like that of the water-hammer. If the experiment be 

 prolonged, and the vacuum completely formed, noticeable quantities 

 of bubbles are produced. — Comptes Rendus, June 6, 1853, p. 994. 



METEOROLOGICAL OBSERVATIONS FOR JUNE 1853. 



Chiswick. — June 1. Overcast : slight rain. 2. Cold haze : overcast : heavy 

 clouds. 3. Fine : clear. 4. Slightly overcast : cloudy and fine : clear. 5, 6. Very 

 fine. 7. Hazy : very fine. 8. Very fine : overcast. 9. Cloudy and mild. 10. Fine. 

 11. Slight haze : fine. 12. Overcast : rain. 13. Constant rain. 14. Cloudy. 



15. Very fine : heavy clouds : overcast. 16. Very fine : clear. 17. Cloudy and 

 fine. 18. Fine. 19. Kain. 20. Very fine : cloudy and showery at night. 

 21. Very fine : rain : clear. 22. Cloudy : slight rain. 23. Fine : clear at night. 

 24. Very fine : clear. 25. Rain : cloudy : rain. 26. Overcast : rain at night. 

 27. Densely overcast : slight rain. 28. Overcast. 29. Cloudy and fine. 30. 

 Showery. 



Mean temperature of the month 59°'16 



Mean temperature of June 1852 „.. 58*01 



Mean temperature of June for the last twenty-seven years . 60 *56 

 Average amount of rain in June l'77inch. 



Boston. — June 1—5. Cloudy. 6. Fine : rain p.m. 7, 8. Fine. 9. Cloudy. 

 10 — 13. Fine. 14. Cloudy : rain, with thunder and lightning p.m. 15. Fine. 



16. Cloudy. 17. Fine. 18. Cloudy. 19. Rain : rain a.m. and p.m. 20. Fine : 

 rain p.m. 21. Cloudy : rain p.m. 22. Cloudy : rain a.m. and p.m. 23. Cloudy. 

 24. Fine. 25. Cloudy : rain a.m. 26, 27. Cloudy : rain a.m. and p.m. 28. Cloudy : 

 rain a.m. 29. Fine : rain a.m. 30. Cloudy : rain p.m. 



Sandwich Manse, Orkney. — June 1. Fog a.m.: damp p.m. 2, 3. Drops a.m. : 

 cloudy p.m. 4. Cloudy a.m. and p.m. 5. Clear a.m. : cloudy p.m. 6. Cloudy 

 a.m. : showers, fine p.m. 7. Clear, fine a.m. : clear p.m. 8. Clear a.m. : hazy p.m. 

 9. Drizzle a.m. : showers, fog p.m. 10. Fog a.m. and p.m. 11. Fog a.m. : 

 showers, hazy p.m. 12. Hazy a.m. and p.m. 13. Bright a.m. : clear, fine p.m. 

 14. Bright, fine a,m. : cloudy p.m. 15. Showers a.m. : cloudy p.m. 16. Cloudy 

 a.m. : cloudy, fine p.m. 17. Cloudy a.m. : rain p.m. 18. Rain a.m. : cloudy p.m. 

 19. Bright a.m.: rain p.m. 20. Damp a.m.: clear, fine p.m. 21. Clear, fine 

 a.m. and p.m. 22. Clear, fine a.m. : fog p.m. 23. Damp a.m. : clear p.m. 24. 

 Showers a.m. and p.m. 25. Showers a.m. : clear p.m. 26. Bright a.m. : clear p.m. 

 27. Rain a.m. and p.m. 28. Bright a.m. : cloudy p.m. 29. Rain a.m. : showers 

 p.m. 30. Cloudy a.m. and p.m. 



Mean temperature of June for twenty-six previous years 52° # 69 



Mean temperature of June 1852 55 *33 



Mean temperature of this month 55 '21 



Average quantity of rain in June for seven previous years ... 2 # 46 inches. 



