] Proceedings. 
cutting between Forest Hill and New Cross as a sheltered place 
in cold soil (clay), and therefore subject to fog, and noted a 
spring at Haslemere from which a mist rises during sharp frost, 
the temperature of the water being then much higher than that 
of the air.* 
1891. 
8. Rosrron noted remarkably low temperature at’ Beddington 
on November 28th, 1890—down to 2°3°, the thermometer on 
the snow as low as —8°. ‘The minimum must have been about 
5 p.m., the extreme cold lasting only a few minutes.’’} 
1892. 
F. J. Broprze. On the Prevalence of Fog in London . . 
1871 to 1890.t 
B. Lataam. Evaporation and Condensation (Address §). 
Calls attention to a number of experiments that he had made 
in Croydon, ‘‘ which throw some light upon the conditions which 
promote or check evaporation.’ Detailed accounts of the investi- 
gations are given, and the results of those made with a floating 
evaporator of a foot diameter are that ‘‘ the annual average amount 
of water evaporated in these thirteen years was 19°948 inches; 
but at certain times there was condensation, and this averaged a 
little over three-tenths of an inch a year. With an evaporator of 
five inches diameter freely exposed to air, there was an average 
annual depth of evaporation equal to 38:185 inches.” The 
chief factor in evaporation is movement of the air; sunshine is 
of more limited effect. 
A curious result of our Park Hill railway-cutting is noticed. 
It diverted water from the drainage-area of the River Graveney, 
reducing this from 8:35 to 7:8 square miles. 
1893. 
R. H. Scorr. Fifteen Years’ Fogs in the British Islands, 
1876-1890. || 
‘If we take the winter first, as being the fogsiest season, the 
greatest number of fog observations is in the Thames Valley 
and Yarmouth. The six months total, October to March, being 
for London 680” (p. 230). But it is satisfactory to know that 
a prevalent idea as to tle increase of fogs in London is baseless, 
‘neither in any monthly nor in the annual curve is there any 
* Proc. Holmesdale Nat. Hist. Club for 1888-9, published 1890, p. 7. 
t Quart. Journ. Roy. Meteor. Soc., vol. xvii, p. 42. 
t Ibid., vol. xviii, p. 40. 
§ Ibid., pp. 53-67. 
|| Tbid., vol. xix, pp. 229, &e. 
