Meteorological Observations. 247 



ON THE MAGIC SQUARE OF THE KNIGHT'S MARCH. 



In Mr. Beverley's Chess-Knight's March (Phil. Mag. Aug. 1848), 

 Mr. Beverley might have added that the squares whose diagonals 

 are 31. 3. 15. 61, 25. 41. 39. 23, and the other halves 1 . 5 1 . 17. 13, 

 5. 53. 59. 11, are likewise magic squares, whose sides form the sum 

 130. Imagine a prism on a square base, having the rows 1, 2 : 3, 4 : 



5, 6 : 7, 8 successively written on the sides ; then any two consecu- 

 tive sides present a double square, each of which is the magic square 

 of 130. Further, 65 = 644-1, 130 = 2(64 + 1), 260=4(64 + 1). 



S. M. Dbach. 

 August 10, 1848. 



METEOROLOGICAL OBSERVATIONS FOR JULY 1848. 



Chiswick. — July]. Clear: cloudy and cold: clear. 2. Fine: overcast. 3. 

 Drizzly : overcast. 4. Overcast. 5, 6. Very fine. 7. Sultry : cloudy. 8. Fine : 

 heavy showers. 9. Constant rain. 10—13. Very fine. 14. Very fine : thunder, 

 lightning and rain at night. 15. Cloudy and fine : clear at night. 16 — 18. Very 

 fine. 19. Cloudy. 20. Cloudy and boisterous. 21. Clear: cloudy: rain. 

 22. Clear : cloudy. 23. Cloudy : fine : rain. 24. Cloudy and fine. 25. Rain. 

 26. Overcast : boisterous, with slight rain. 27. Cloudy. 28, 29. Very fine. 

 30. Overcast : rain. 31. Rain : overcast. 



Mean temperature of the month 62°*9 



Mean temperature of July 1847 65 '84 



Mean temperature of July for the last twenty years 63 "14 



Average amount of rain in July 2*36 inches. 



Boston. — Juty 1. Rain: rain a.m. and p.m. 2. Fine: rain p.m. 3. Fine. 

 4. Cloudy. 5. Fine. 6. Fine : thermometer 84° 2 p.m. 7. Cloudy. 8. Windy. 

 9. Rain. 10. Cloudy, if. Fine. 12. Cloudy. 13. Fine. 14. Fine: rain 

 and thunder p.m. 15. Cloudy. 16 — 18. Fine. 19. Cloudy. 20. Cloudy : rain, 

 with thunder and lightning p.m. 21. Fine : rain p.m. 22. Fine. 23,24. Cloudy: 

 rain p.m. 25. Cloudy : rain a.m. 26. Rain : rain a.m. and p.m. 27. Cloudy. 

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



Applegarth Manse, Dumfries-shire. — July 1. Dull a.m. : cleared and fine. 2. 

 Heavy showers. 3,4. Fair and fine, though sharp. 5. Cloudy p.m., but fair. 



6. Heavy rain a.m. : cleared. 7. Heavy shower. 8. Very heavy showers. 

 9. Rain a.m. : cleared p.m. 10. Fine, but cloudy. II. Fine: warm. 12. Very 

 fine. 13. Very sultry : thunder. 14. Fine soft shower p.m. 15. Fine : thunder. 

 16. Fine bracing air. 17. Fine, but cool. 18. Drizzling day. 19. Rain all 

 day. 20. Frequent showers. 21. Bright and dry : shower p.m. 22. Wet nearly 

 all day. 23. Occasional showers. 24. Fine : slight shower. 25. Wet. 26. 

 Fine throughout. 27. Heavy shower : thunder. 28. Showery : fine p.m. 29. 

 Fair and fine. 30. Rain all day. 31. Fine, though cloudy. 



Mean temperature of the month 56°'5 



Mean temperature of July 1847 61 # 5 



Mean temperature of July for the last twenty- five years . 58 *1 



Average amount of rain in July for twenty years 3'91 inches. 



Sandwick Manse, Orkney. — Julyl. Bright : drops. 2. Bright : clear. 3. Clear. 

 4. Cloudy : damp. 5. Bright : cloudy. 6. Rain : cloudy. 7. Bright : thunder 

 and rain. 8. Bright: fog. 9. Fog. 10. Cloudy: clear. 11. Bright: rain. 

 12. Bright : damp. 13. Cloudy. 14. Cloudy: clear. 15. Bright: drizzle. 

 16,17. Damp : drizzle. 1 8. Showc rs : cloudy. 19. Rain : damp. 20. Damp: 

 rain. 21. Bright : drops. 22. Bright : rain. 23. Showers : clear. 24. Bright: 

 clear : showers. 25. Bright : heavy showers. 26. Bright : drops. 27. Rain : 

 damp. 28. Clear. 29. Clear : fine. 30. Showers : rain. 31. Clear : cloudy. 



