Meteorological Observations. 399 



P. 273. For the rendering of paragraph 25 a, the following should 

 be substituted : — 



" When the length of one of the inductor wires remains invariable, 

 and that of the other is gradually increased, for lengths of the addi- 

 tional wire increasing in geometrical progression, the intensities of 

 the induced current measured by the rheometer diminish according 

 to an arithmetical progression the first term of which corresponds 

 to the sum of the effects of the inductor wires when the length of 

 the additional wire is null, and the last term of which is equivalent 

 to the action of the constant inductor wire taken isolatedly, or to such 

 a length of the additional wire that the lengthened circuit be an in- 

 finitely less good conductor than the invariable circuit." 



P. 274, for 26 a, read as follows : — 



" For additional lengths of the inductor wire increasing in geome- 

 trical progression, the deviations of the rheometer measuring the 

 diflference of intensity of the two currents simultaneously induced 

 increase according to an arithmetical progression, of which the first 

 term is zero and the last equivalent to the action of the constant in- 

 ductor wire, taken isolatedly, or to an infinite additional length." 



METEOROLOGICAL OBSERVATIONS FOR SEPT. 1844. 



Chisioick. — September 1. Slight fog: exceedingly clear, hot and dry. 2. Foggy: 

 clear, hot and dry, 3. Fine : overcast. 4. Densely overcast and fine. 5. Cloudy 

 and fine. 6. Rain : cloudy. 7. Slight rain: cloudy: clear and fine. 8. Very 

 fine. 9. Densely overcast. 10. Overcast and fine. 11. Slight fog : very fine. 

 12. Overcast and fine. 13,14. Very fine. 15. Cloudy : rain. 16. Very fine. 

 17. Showery: heavy rain at night. 18. Rain. 19. Clear and very fine. 20. 

 Drizzly: hazy. 21. Very fine. 22, 23. Cloudy: very fine. 24. Very fine. 

 25. Slight fog : very fine. 26, 27. Mornings foggy : clear and fine. 28. Dense 

 fog : heavy dew: clear and exceedingly fine. 29. Drizzly : cloudy and fine : clear : 

 slight frost. 30. Slightly overcast : clear and fine. — Mean temperature of the 

 month 1°*8 above the average. ^ 



Boston. — Sept. 1, 2. Fine. 3. Cloudy. 4. Windy. 5. Windy: lightning 

 at night. 6. Cloudy: rain, with thunder and lightning from noon to 5 p.m. 

 7. Cloudy. 8. Fine. 9. Rain. 10, II. Fine. 12— 14. Cloudy. 15. Stormy: 

 rain early a.m. 16. Fine. 17. Cloudy : rain early a.m. : rain a.m. 18. Cloudy. 

 19. Fine; rain early a.m. 20. Fine : rain early a.m. : rain p.m. 21, 22. Cloudy. 



23. Windy ; rain a.m. and p.m. 24. Fine : rain p.m. 25 — 28. Fine. 29. Cloudy : 

 rain early a.m. 30. Cloudy. 



Sandwick Manse, Orkney. — Sept. 1. Clear. 2. Clear: hot. 3. Clear: 

 drizzle. 4. Fog : fine : fog. 5. Bright : clear. 6. Cloudy : fine : fog. 7. Damp : 

 cloudy. 8. Cloudy. 9. Cloudy : showers. 10. Bright : clear. 11, 12. Bright: 

 showers. 13. Bright: clear. 14. Frost: clear. 15. Damp: drizzle. 16. Damp: 

 drizzle : showers. 17. Drops : drizzle : showers. 18. Frost : clear : cold. 19. 

 Clear : aurora. 20. Frost: clear: aurora. 21. Frost: clear. 22,23. Clear. 



24. Clear : cloudy. 25. Drizzle : cloudy. 26. Showers : drizzle. 27. Damp : 

 drizzle. 28. Cloudy : clear. 29. Showers : clear. 30. Rain. 



Apjylegarlk Manse, Dumfries-shire. — Sept. 1 — 4. Fair and fine. 5. Fair and 

 fine, but cloudy. 6. Showery : lightning. 7. Shower : thunder. 8. Shower. 

 9. Fair and fine. 10. Fair and fine, but cloudy. 11. Fair and fine : one slight 

 shower P.M. 12. Rain p.m. 13. Rain all day. 14. Rain very heavy, l."). Fair. 

 16. Shower. 17. Showery. 18 — 22. Fair: fine harvest day. 23. Fair, but 

 cloudy. 24. Fair : clear. 25. Fair : cloudy. 26. Fair. 27. Fair : cloudy. 

 28. Rain all day. 29, 30. Fair and clear. 



