368 Mr. J. Glaisher's Remarks on the Weather 



a fall as 24*3 inches within the first nine months of the year 

 has probably not been exceeded within this century. 



The temperature of the water of the Thames was 63 p, by 

 day, and 62°*0 by night. The water, on an average, was 3°*9 

 warmer than the air. 



The horizontal movement of the air was about 130 miles 

 daily; during the period of time between July 19 and July 27 

 it amounted to 233 miles per day ; from July 31 to August 6 

 its average daily value was 240 miles; and on August 21 it 

 exceeded 300 miles. 



The highest and lowest readings of the thermometer in Air at 

 the height of four feet above the ground, and protected as 

 much as possible from the effects of radiation and rain, were 

 85°'3 and 32°"8. 



The average daily ratiges of the readings of the thermometer 

 in Air at the height of four feet, were 22 0, 5 in July, 18 0, 5 in 

 August, and 20 o, 9 in September. The average ranges for 

 these months from the observations of the seven preceding 

 years were 17°'2, 17 0, 1, and 16°*2 respectively. 



In July the readings of the thermometer on grass were 29 n, 5 

 on one night ; between 32° and 40° on nine nights ; between 

 40° and 50° on twelve nights ; and above 50° on nine nights. 



In August the lowest reading was 36°: and the readings 

 were below 40° on four nights; between 40° and 50° on 

 eighteen nights; and above 50° on nine nights. 



In September the readings were below 32° on nine nights, 

 and the lowest was 23° ; they were between 32° and 40° on 

 seven nights ; between 40° and 50° on nine nights ; and above 

 50° on four nights. 



The mean amount of cloud for July was 6'6, for August was 

 7" 6, and for September was 5'6. The average values for the 

 seven preceding years were 6*7, 6*3, and 6*0 respectively. 



There were five exhibitions of the aurora borealis during 

 the quarter, which occurred on July 11, August 28, September 

 4, 8 and 18. 



Thunder-storms at different parts of the country occurred 

 on July 14, 26, August 1, 3, 4, 5, 6, 7, 8, 9, 10, 11, 22, 23, 31, 

 and September 5; and lightning unaccompanied by thunder 

 was seen on July 24, August 23, 24, 25, September 22 and 25. 

 The storms of July 14 were observed at Greenwich, Latimer 

 Rectory, Cardington, Saffron Walden and Leicester. At 

 Greenwich, thunder-clouds were observed first in the west and 

 north-west at 8 h 30 m p.m. ; and from this time till near mid- 

 night the thunder followed the lightning at intervals varying 

 from 5 8 to 40 s ; and lightning was visible during the whole of 

 the night. At Latimer the storm is described as awful, and 



