during the Quarter ending September SO, 1849. 363 



This remark applies to the place at which Osier's anemo- 

 meter is placed at Greenwich, viz. at an elevation of upwards 

 of 200 feet above the level of the sea, and near the northern 

 extremity of the table-land forming Blackheath. At places at 

 a less elevation, the movement of the air was very much less 

 than the above ; on many days, when a strong breeze was 

 blowing on the top of the observatory and over Blackheath, 

 there was not the slightest motion in the air near the banks of 

 the Thames; and this remarkable calm continued for some 

 days together, particularly from August 19 to the 24'th, on the 

 29th, from September 1 to the 10th, and after September 15. 

 On September 11 and 12 the whole mass of air at all places 

 was in motion, and the first time for nearly three weeks, the 

 hills at Hampstead and Highgate were seen distinctly from 

 Greenwich. 



From the published observations of the strength of the wind 

 daily at all parts of the country, it would seem that the air 

 has been for days together in a stagnant state at all places 

 whose elevation above the sea is small. 



The readings of the thermometer on grass in July were 

 below 40° on four nights; the lowest was 32°'8 ; between 40° 

 and 50° on twenty nights, and above 50° on seven nights. In 

 August the readings were below 40° on five nights ; the low- 

 est reading was 34°'5 ; between 40° and 50° on ten nights, and 

 between 50° and 60° on twelve nights. In September the 

 readings were below 40° on six nights; between 80° and 40° 

 on twelve nights, and about 50° on ten nights. 



At Cardington the lowest reading on grass in July was 

 31°-8, in August was 32% and in September was 27°. The 

 mean of all the lowest readings was 45°*5 in July, 47°'t) in 

 August, and was 44°* 1 in September, as observed by Samuel 

 Charles Whitbread, Esq. 



There were three exhibitions of the aurora borealis. The 

 first was seen on August 18 at Whitehaven ; the second was 

 seen at Latimer on September 3 at 8 p.m., when a rose- 

 coloured auroral arch was seen extending from south-west to 

 north-east across the zenith; and on Sept. 16 an aurora was 

 seen at Stony hurst. 



Thunder-storms occurred on July 18 at Nottingham and 

 Leicester; on July 19 at Camberwell, Saffron Walden, Uck- 

 field and Greenwich ; on July 20 at Nottingham, Camberwell, 

 Saffron Walden, Leicester, Uckfield and Greenwich ; on 

 July 23 at Hartwell Rectory, Stone and Leicester; on July 

 24 at Camberwell ; on July 25 at Hartwell Rectory, Stone 

 and Camberwell; on July 26 at Camberwell, Leicester and 

 Greenwich; on July 29 at Nottingham and Leicester; on 



