4 Proceedings. 



fell considerably below the freezing-point, but from the 

 warmth of the sun in the day the thermometer rose to 48° 

 and 50°. From March 1st to 3rd the mornings were hazy, 

 with low temperature at night, but the haze cleared oflf as the 

 sun rose in the heavens, presenting on the 1st of the month 

 a cloudless sky, and on the 2nd and 3rd of the month only a 

 few light clouds were observable. On the 4th the day grew 

 hazy, on the 5 th the atmosphere was dull, and so continued 

 until the lOtli of the month. 



Gales. — Strong breezes prevailed on February 2nd and 

 3rd. A heavy gale blew on the night of March 21st and 

 morning of the 22nd, and again on April 1st; from the 5th to 

 the 8th were gales from the N.E. On August 31st there was a 

 gale which lasted the entire day, and also on the night of 

 September 1st. A strong gale occurred on the night of 

 October 29th, and during the day of November 1st. 



Thunder and Lightning. — As has been observed, the 

 district of Redhill is but Uttle disturbed by electric storms, 

 while the neighbourhood of Wandsworth and Clapham, and 

 the adjacent valley of the Thames often suffer from violent 

 thunder-storms. Thunder was heard and lightning seen on 

 July 16th, and August 16th and 17th. Thunder was heard 

 in the daytime of August 31st. Faint lightning was seen on 

 October 30th. On the same night a heavy storm with 

 thunder and hghtning occurred at Brighton. 



Mr. T. P. Newman contributed the following paper on 

 ♦ FOG ' :— 



Fog arises primarily from calm weather. What is the 

 cause of calm weather I will advert to later on. The earth's 

 surface gives off heat, and becomes so cold as to condense 

 vapour in the air near the ground, and this becomes fog or mist ; 

 or it condenses on some suitable surface, such as grass, and 

 becomes dew. It being calm, the mist or fog so caused 

 remains ; if it were not calm, the air would move away so 

 rapidly that there would be no time for it to condense ; each 

 successive layer passes on, and does not get time to condense. 



In summer-time the mist and the dew formed by radiation 



