Meteorological Observations for July 1828. 239 



At half-past 8 o'clock in the evening of the 3rd instant, the clouds as- 

 sumed a black electrical aspect, and the lightning and thunder gradually 

 came on as they united by means of crossing currents of wind from S.W. 

 by W. and S.E. From that time till sunrise the following morning, when 

 the S.E. wind ceased to blow, the lightning was almost incessant, the 

 flashes frequently amounting to 12 or 15 in a minute, and the streams of 

 electric fluid presented themselves in almost every geometrical form, ac- 

 companied with light showers of rain at intervals. So much lightning 

 from the passing clouds has not been observed here at any time since the 

 night of the 28th of July 1814, when it was nearly similar in appearance 

 for the same space of time. In the nights of the 7th and 8th we had vivid 

 sheet lightning, and lightning and thunder in the afternoon of the 14th, 

 which were produced by means of two winds crossing at right angles, and 

 the consequent inosculation of the clouds. From the 26th of June to the 

 18th of July, the summer cockchafers were very numerous during the even- 

 ing twilight : and for two or three years past a great number of the species 

 of the Melolontha solstitialis has also appeared in the evenings of June and 

 July, and are considerably smaller than those that generally come in May. 



The mean temperature of the external air this month is about one degree 

 and a half higher than the mean of July for the last twelve years. 



The atmospheric and meteoric phenomena that have come within our 

 observations this month, are one lunar and nine solar halos, one meteor, 

 one rainbow, lightning and thunder on three different days; and eight 

 gales of wind, namely, one from the South-east, two from the South-west, 

 three from the West, and two from the North-west. 



REMARKS. 



London. — July 1. Very fine. 2. Overcast in morning; .fine, 3. Very 

 fine ; sultry with heavy thunder storm at night. 4. Cloudy and warm. 



5. Very fine. 6. Cloudy with showers. 7. Fine. 8. Sultry with thunder, 

 and slight rain at night. 9. Showery: heavy rain at night. 10. Showery 

 morning: fine. 11. Cloudy. 1 2. Heavy rain. IS. Showery. 14. Sultry 

 with much thunder. 15. Showery. 16, 17. Fine. 18, 19. Showery. 

 20. Rainy, with thunder. .21. Fine morning: rain at night. 22. Showery. 

 23. Showery, with thunder. 24. Cloudy, with showers. 25. Fine morn- 

 ing : showery. 26. Cloudy, with showers. 27. Showery. 28. Very fine. 

 29. Showery. 30. Fine. 31. Very fine. 



Boston. — July 1 — 4. Cloudy. 5 — 7. Fine. 8, 9. Rain. 10. Stormy. 

 1 J . Fine. 12. Rain. 1 3. Stormy and rain. 14. Fine : rain a.m. and p.m. 



15. Rain. 16. Cloudy. 17. Rain. 18. Cloudy: thunder and lightning, 

 with rain p.m. 19. Cloudy. 20. Cloudy : rain p.m. 21. Cloudy. 22 — 24. 

 Fine. 25. Rain : heavy rain. 26. Cloudy. 27. Rain. 28. Fine : rain at 

 night. 29. Fine : thunder, hail, and rain, p.m. 30. Rain. 31. Cloudy. 



" The quantity of rain fallen in the last month exceeds that of any other 

 month from the commencement of my observations in August 1823, by 

 three inches and eighty-four hundredths.' The greatest fall of rain, except 

 as above, that I ever noticed was in September 1826. The rain-gauge in 

 that month indicated a fall of 4*18.— The average height of the Barometer 

 is only 29-15."— S. V. 



Penzance.— July 1 . Fair : rain. 2. Fair : showers. S. Rain. 4, 5. Fair. 



6. Clear. 7. Fair: rain. 8. Fair. 9. Rain: fair. 10. Fair. 11. Fair: 

 rain. 12. Clear. 13. Clear: showers. 1 4. Fair : showers. 15. Showers. 



16. Fair : showers. 17. Fair: rain. 1 8. Fair : showers. 19, 20. Clear: 

 showers. 21. Fair: showers. 22. Fair. 23. Misty rain. 24. Rain. 

 25, 26. Fair: showers. 27. Fair: clear. 28 — 30. Clear. 31. Fair. 



Meteoro 



