Meteorological Observations, 163 



** The expressions used by Poisson in his solution of the problem 

 are 



p =gmh( l+s + ff) 

 and 



(T=fis; 

 therefore we have 



p=gmh(l + (l-^f3)s). 



" I have shown in the Philosophical Magazine for April, page 318, 

 and June, page 476, that no reason has been given which proves 

 that /3 is finite in value. 



" Mr. Rankine asserts in the last Magazine, that I have stated this 

 of (l-fi^). and then proceeds to argue upon it. He has evidently 

 considered the arguments applied with respect to the value of j3 to 

 have been applied with respect to that of 1 +/3." 



" In his concluding remark he says, with respect to the popular 

 view of Laplace's proposal to account for the discrepancy shown by 

 the Newtonian formula, ' My remarks were intended to apply to 

 waves, which, having been originally symmetrical, become unsym- 

 metrical as they advance, like those on the surface of shallow water,' " 

 which Mr. Potter considers inconsistent with Mr. Rankine's state- 

 ment in the Magazine for March, page 266, where he says, " as every 

 wave must consist of a comjjressed and a dilated part, the different 

 parts of a wave would travel with different velocities, the compression 

 and dilatation existing from the beginning." 



METEOROLOGICAL OBSERVATIONS FOR JUNE 1851*. 

 Chiswick. — June 1, 2. Very fine. 3. Fine: cloudy. 4. Cloudy: fine : clear: 

 cold at night. 5. Densely clouded : rain. 6. Boisterous : cloudy and fine. 

 7. Densely overcast : slight rain. 8, Boisterous. 9. Drizzly. 10. Uniformly 

 overcast : rain. 11. Very fine. 12. Densely clouded : showers. 13. Overcast: 

 densely clouded : rain. 14. Fine : heavy clouds : slight rain. 15. Cloudy : rain. 

 16. Boisterous. 17. Cloudy and fine. 18. Very fine : boisterous. 19 — 21. 

 Very fine. 22. Cloudy : clear. 23. Fine : clear and cold at night. 24, 25. Very 

 fine. 26, 27. Hot and very dry. 28, 29. Hot and dry. 30. Slightly clouded. 



Mean temperature of the month 59°'21 



Mean temperature of June 1850 59*26 



Mean temperature of June for the last twenty-five years . 60 '72 



Average amount of rain in June 1*80 inch. 



Boston. — June 1, 2. Fine. 3. Fine: rain p.m. 4. Fine. 5 — 7. Cloudy: 

 rain A.M. and P.M. 8. Cloudy. 9, 10. Cloudy : rain p.m. 11. Fine. 12. Cloudy: 

 rain A.M. 13. Cloudy : rain p.m. 14. Fine. 15. Fine : rain p.m. 16. Cloudy: 

 stormy. 17. Fine: stormy. 18 — 20. Cloudy. 21. Fine: thunder and light- 

 ning, with rain and hail p.m. 22 — 25. Cloudy. 26 — 30. Fine. 



Sandwich Manse, Orkney. — June 1 . Bright : showers. 2. Bright ; rain. 3. 

 Clear. 4. Showers: fine. 5. Fine: showers. 6. Fine: clear. 7. Bright: 

 fine. 8. Rain : hazy. 9. Showers : clear. 10. Showers : damp. 11. Showers. 

 12. Clear: fine. 13. Bright: fine. 14. Fine: hazy. 15. Rain. 16. Rain: 

 drizzle. 17. Showers: clear. 18. Fine: drizzle. 19. Showers: hazy. 20. Fine: 

 clear. 21. Bright; showers. 22. Cloudy. 23. Bright : drizzle. 24. Cloudy. 

 25. Bright : damp. 26. Cloudy : clear. 27, 28. Clear : fine. 29. 30. Hot : 

 fine. 



* The observations from the Kev. W. Dunbar of Applegarth Manse have 

 not reached us. 



