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LV1I. Remarks on the Weather during the Quarter ending Sep- 

 tember 30. 1848. By James Glaishek, Esq., of the Royal 

 Observatory, Greenwich *. 



THE meteorological returns for the past quarter furnished 

 to the Registrar-General have been obtained from the 

 usual places. These have been all examined and discussed 

 by myself in the same manner as detailed in the previous Num- 

 bers of the Philosophical Magazine. The following are my 

 remarks upon the weather of the past quarter. 



With the exception of a few days in July, and the period 

 between the 9th and 23rd of September, the weather during 

 the quarter ending September 30, 1848, was wet, with very 

 little sunshine. The month of August was extremely wet, 

 and in many places the falls of rain both in July and Septem- 

 ber were unusually great. So much rain falling in a period 

 immediately following the previous bad weather, renders the 

 season and the year very remarkable. On July 1 the mean 

 temperature of the air was 8 0, 4 below the average value from 

 the seven preceding years, and on the 6th it was 12°"2 in ex- 

 cess above the average ; on the former day the mean tempe- 

 rature was 46°*7, and on the latter day it was 74 o, 0. On the 

 9th it was 3° below the average, and on the 14th it was 9°*4 

 above the average ; and on the 15th it was again below the 

 average. These changes were large and abrupt. From 

 July 11 to September 19 the temperature of the air was almost 

 always below the average value, and particularly so between the 

 11th and the 15th of September; on the 12th the departure 

 from the average was 12° # 6. From the 20th of September to 

 the end of the quarter, the temperature of the air ranged some- 

 what above the average value. 



The hottest day in this year was July 6, and this day was 

 the hottest all over the country. On an average of seven 

 years, the hottest day is July 5. 



In pursuance of the arrangement hitherto followed, I will 

 speak of each subject of investigation separately. 



The mean temperature of the air at Greenwich — 



For the month of July was 61°\5, which is 3°*7, 1°'3, o, 6, 

 o, l, and 1°*7 above those of the years 1841 to 1845 respec- 

 tively, 3°-0 and 3°*9 below those of the years 1846 and 1847; 

 or it is 0°* 1 above the average of these seven years ; 



For the month of August was 58°*5, which is 2 o, 0, 6°*9, 

 3°-6, 4°-7, and 3°'6 below those of the years 1841, 1842, 1843, 

 1846, and 1847 respectively, 0°'8 and 1°*2 above those of the 

 years 1844 and 1845 respectively; or it is 2 0, 7 below the 

 average of these seven years; 



* Communicated by the Author. 



