Meteorological Observations, 391 



rounded groups, a heap of distinct particles is produced, which may 

 be compared with what mineralogists call granular minerals. The 

 continuity of the mass is thus to some extent destroyed, inasmuch 

 as these granular particles only adhere together more or less, and 

 consequently the greater the size and number of these particles the 

 greater is the diminution in tenacity. According to the statement 

 of Kohn, the original condition of iron thus altered cannot be 

 restored by heating to redness and forging, but only by exposure to 

 a welding heat ; and Fuchs considers this a sufficient proof that this 

 alteration of iron consists in a breaking up of the continuity of the 

 mass. The restoration of this continuity requires that the granular 

 iron should, by exposure to a welding heat, be rendered amorphous, 

 when the cohesive force again becomes active, a condition which in 

 the case of most other bodies obtains only when they are liquid.— 

 Schweizerisches Gewerbeblatt, September 1852. 



METEOROLOGICAL OBSERVATIONS FOR MARCH 1853. 

 Chiswick. — March 1. Snowing : sleet : clear and frosty. 2. Uniformly over- 

 cast : fine : overcast : slight frost. 3. Clear : fine : cloudy : clear and frosty. 4. 

 fine: slight rain. 5. Rain. 6. Cloudy: slight rain. 7. Rain: foggy. 8. Uni- 

 formly overcast : rain : foggy at night. 9. Foggy : fine. 10. Overcast : fine : 

 clear. 11. Foggy : fine : slight fog. 12. Dense fog : fine : foggy. 13. Slight fog : 

 very fine : rain at night. 14. Rain : heavy rain : clear and frosty. 15. Hoar- 

 frost : large masses of snow-like clouds : very fine : overcast. 16. Uniform haze : 

 cloudy. 17. Densely overcast : clear and frosty at night. 18. Overcast : frosty. 

 19. Clear : dry air : frosty. 20. Fine : cloudy : frosty. 21. Slight snow : overcast : 

 clear and frosty. 22. Cloudy and cold : clear and frosty. 23. Snow-showers 

 occasionally. 24. Clear. 25. Clear : cloudy : clear and frosty. 26. Quite clear : 

 fine : hazy. 27. Overcast. 28. Cloudy. 29. Foggy : dry cold haze. 30. Dry 

 haze : very fine. 31. Very fine : rain. 



Mean temperature of the month 37°'41 



Mean temperature of March 1852 39*62 



Mean temperature of March for the last twenty-seven years 42 -52 



Average amount of rain in March l'40inch. 



Boston. — March 1. Cloudy: snow a.m. 2 — 5. Cloudy. 6. Cloudy : rain p.m. 

 7,8. Cloudy. 9. Fine. 10. Cloudy. 11. Fine. 12. Cloudy. 13. Fine. 14. 

 Cloudy: rain a.m., and rain and snow p.m. 15. Fine. 16. Cloudy: rain a.m. 

 and snow P.M. 17. Cloudy : snow p.m. 18. Fine. 19. Fine: snow a.m. 20. 

 Fine. 21. Cloudy. 22. Cloudy : snow a.m. and p.m. 23. Cloudy. 24. Fine. 

 25. Cloudy : snow a.m. and p.m. 26. Fine. 27. Cloudy : rain a.m. and p.m. 

 28—31. Fine. 



Sandwick Manse, Orkney. — March 1. Cloudy a.m. : showers, thaw p.m. 2. 

 Showers a.m. : showers, thaw p.m. 3. Fine, frost a.m. : clear, aurora p.m. 4. 

 Fine, thaw a.m. : damp p.m. 5. Fine, clear a.m. : cloudy p.m. 6. Rain a.m. : 

 clear, aurora p.m. 7. Bright a.m. : clear, S. aurora p.m. 8. Cloudy a.m. : clear, 

 aurora p.m. 9. Cloudy a.m. : cloudy, aurora p.m. 10. Cloudy a.m. : clear, 

 aurora p.m. 11. Bright a.m. : clear, aurora p.m. 12. Hazy a.m. : clear, aurora 

 P.M. 13. Bright a.m. : hazy p.m. 14. Hazy a.m. and p.m. 15. Snow-showers 

 A.M. : sleet-showers p.m. 16. Snow-showers a.m. : cloudy p.m. 17. Clear, 

 frost a.m. : clear, aurora p.m. 18, Clear, frost a.m. : snow-showers p.m. 19. Snow- 

 showers A.M. : clear, frost p.m. 20, 21. Snow-showers a.m. and p.m. 22, 23, 

 Clear, frost a.m. and p.m. 24. Clear, snow a.m. : clear p.m. 25. Snow-showers 

 A.M. : clear, frost p.m. 26. Drops a.m. : rain p.m. 27. Bright a.m. : fine p.m. 

 28. Bright a.m. : fine, aurora p.m. 29. Clear a.m. : fine p.m. 30. Bright a.m. : 

 clear p.m. 31. Bright a.m. : cloudy p.m. 



Mean temperature of March for twenty-six previous years ... 40°*46 



Mean temperature of this month 38 '24 



Average quantity of rain in March for seven previous years . 2'30 inches. 

 •83 of that marked as rain is melted snow. 



