xxvm 
PROCEEDINGS OE THE 
it should he gently rocked to keep the solution in motion. The 
obj ect would be perceived gradually appearing on the plate, which, 
when fully developed, must be rinsed in clean water and placed in 
a solution of hyposulphite of soda. In a few minutes the white¬ 
ness seen on the back of the plate would disappear and the picture 
would be “fixed.” After another rinse in water the negative 
would be completed, and might be taken to the daylight and 
examined at leisure. Before it was put into a rack to dry, it was 
advisable that it should remain for one hour in running water. 
The negative being dry, then came the printing process, a work 
in which amateurs as a rule did not excel, for it required much 
patience, and comprised several operations full of detail, each of 
which must have very careful attention. 
The prints, having been obtained, should be rinsed, and then 
placed in the toning-dish. Emerging from the toning-dish, they 
should receive another rinse, and be fixed by being placed in a 
solution of hyposulphite of soda and ammonia. In about a quarter 
of an hour the print would be fixed, and should then be allowed to 
remain in running water for four or five hours and afterwards dried 
on blotting-paper. The final process was that of mounting. 
Mr. White also dealt with the subject of varnishing negatives, 
photographing by magnesium light, and the process of printing on 
platinotype paper. In conclusion, he expressed a hope that his 
paper might be the means of enrolling some amateur photographers 
as members of the Society, and that the pleasure of the summer 
excursions might be enhanced by the practice of this engaging art, 
and the interest of the winter meetings by its theory. 
The following geological photographs (whole-plate), kindly lent 
by Mr. Osmund W. Jeffs, Secretary of the British Association 
Committee on Geological Photography, were exhibited by Mr. 
Hopkinson in illustration of his paper :— 
Four views in Storeton Quarry, Cheshire, two of them showing 
footprint-bed in Keuper Sandstone. Junction of Keuper and 
Bunter Sandstone at West Kirby, Cheshire. Open face of fault at 
Calday Grange, West Kirby. Junction of (?) Bunter and Keuper 
Sandstone at Hilbre Island, Biver Dee, Cheshire. Two views of 
conglomerate-bed (pebble-bed of Geological Survey), (?) Bunter, 
Middle Island, Hilbre. Current-bedding in Keuper Sandstone, 
Wallasey, Cheshire. Two views of the “ Calderstones,” Wootton, 
near Liverpool. Anticlinal in Carboniferous Limestone, Draughton, 
near Skipton, Yorks. Two views of contorted strata at Draughton. 
Scarlett Point, Isle of Man; and glaciated surface of Carboniferous 
Limestone, Port St. Mary, Isle of Man. Stack of Mharagast, Isle 
of Bum. Flagstone, East Cliff, Holborn Head, Caithness. Stack 
of contorted gneiss, Whitenhead, Sutherland. 
Mr. Monckton White also exhibited a large collection of photo¬ 
graphs, including several taken by himself, and his camera and 
other apparatus referred to in his paper. 
