COUNCIL FOR 1891 . 
13 
cameras and instantaneous work produced by their aid. This, 
the most difficult brancli of photography, was ably illustrated, 
showing that the section numbers among its members some 
adepts in the use of the liand camera. The manipulators very 
fully explained their methods of working, in the course of 
which explanation many little points of vital importance were 
strongly emphasized. 
In April several members of the Section gave a public 
exhibition of lantern slides in the theatre, at which the exhibits 
were of full average quality and afforded to the audience a 
pleasant and instructive evening. 
In the laboratory of the Section there has been fitted up 
an apparatus for enlarging by artificial light without the use of 
a condenser, designed by one of the Vice-Presidents of the 
Section, Mr. W. Monkhouse. The apparatus is also adapted 
for the production of lantern slides by reduction as well as for 
the copying of book illustrations and pictures generally. 
Manj^ fine enlargements produced by aid of the apparatus were 
on view at the Conversazione given by the Society in December 
last. 
Meteorology. —The last year was exceptional both as 
regards temperature, pressure, and rainfall. 
Ten special instances are noted towards the close of the 
remarks on the half century of our Eeports. 
Temperature was below the average. The 9 a.m. and 9 p.m. 
returns give a mean of 46’6“; the mean of the max. and min. 
records is 46’85®. After the thaw in January, February was 
mild, March cold, but April and early May exceptionally so. 
The serious frosts of the latter month form the subject of a 
separate paper. 
The extreme of heat 79’9° was the same as last year; but 
occurred 40 days later, on September 13. In January the 
Mercury fell just below 10°. December opened with remarkable 
mildness, but, turning colder, the week before Christmas gave 
us probably the worst visitation of Fog that York has known. 
The number of Frosts were:—January 25, February 20, 
March 20, April 14, May 6, October 5, November 7, December 
17 ; Total 114. This would seem to be excessive, 
