Meteorological Observations for October 1827- 467 



The following are the days on which the migrations of the swallows to 

 and from this neighbourhood have been successively noted for the last 

 twelve years, — a circumstance which serves to point out their wonderful in- 

 stinct, in regard to the changes that take place in the temperature of the 

 atmosphere soon after the vernal and autumnal equinoxes. 



ARRIVAL. DEPARTURE. 



1816 April 23rd Not observed. 



1817 21st Weeks, Days. 



1818 25th September 29th. diff. ... 22 3 



1819 22nd October 1st. ... diff. ... 23 1 



1820 26th l:3th. diff. ... 24 2 



1821 15th 8th. ... diff. ... 25 1 



1822 27th September 28th. diff. ... 22 



1823 23rd Not observed. 



1824 18th October 18th. diff. ... 26 1 



1825 13th 11th. diff. ... 25 6 



1826 I8th September 27th. diff ... 23 1 



1827 13th October 3rd. diff. ... 24 4 



The greatest deviation in the time of their arrival is 2i fortnight, and in 

 the time of their departure four weeks, which may be considered as regular, 

 and in some instances more uniform than the springs and falls of those 

 years. 



The atmospheric and meteoric phcEnoviena that have come within our 

 observations this month, are one parhelion, three solar halos, one meteor, 

 one aurora borealis, ten rainbows, lightning and thunder on the 10th and 

 11th, and seven gales of wind, namely, one from N., one from E., one from 

 S.E., one from S., and three from S.W. 



REMARKS. 



London. — Oct. 1. Cloudy with rain. 2, 3. Cloudy. 4. Cloudy and fine. 

 5 — 7. Fine. 8. Fine : cloudy: rain in the night. 9,10. Rainy. 11. A 

 thunder-storm about 1 in the morning; afternoon showery. 12. Cloudy. 

 13 — 15. Fine. le.Cioudy. 17, 18. Fine. 1 9. Rainy morning. 20. Cloudy. 

 21. Fine: cloudy. 22. Rainy. 23. Cloudy and fine. 24 — 26. Cloudy. 

 27. Fine day : rainy night. 28. Rainy. 29. Fine. 30. Cloudy. 31. Fine. 



Penzance. — Oct. 1. Rain. 2. Fair. 3. Fair : misty rain. 4. Misty rain. 

 5, 6. Clear. 7. Clear: rain. 8—10. Rain. 11. Showers. 12, 13. Clear. 

 14 — 18. Misty rain. 19, 20. Showers. 21, 22. Rain. 23. Showers. 24, 



25. Rain. 26. Fair. 27, 28. Rain. 29, 30. Clear. 31. Fair. — Rain-gauge 

 ground level. 



lioHlon. — Oct. 1. Cloudy. 2. Misty. 3. Cloudy. 4 — 6. Fine. 7. Foggy. 

 8. Cloudy: rain at ni!;ht. 9. Cloudy : rain, a.m. and p.m. 10. Cloudy: 

 stormy night, with rain. U. Cloudy: rain a.m. and rain at night. 12. 

 Cloudy. 13, 14. Fine. 15, 16. Cloudy. 17 — 19. Fine. 20. Rain : heavy 

 rain, A.M. 21. Cloudy. 22. Cloudy: rain a.m. 23. Cloudy : shower of 

 rain, with thunder and lightning, p.ai. 24. Foggy. 25. Fine : rain p.m. 



26. Fine. 27. Cloudy : rain p.m. 28. Rain. 29 — 31. Cloudy. 



RESULTS. 



Winds. N. 1 : NE. 3 : E. 2: SE. 1 1 : S. 3 : SW. 3 : W. 1 : NW. 7. 



London. — Barometer: Mean height for the month 29'927incli. 



Thermometer : Mean height for the month 53'435° 



Eva{)oration 1'47 inch. 



Rain 449. 



Mcteoro- 

 3 02 



