452 On Sun Pictures. 
Canson-fre-res, a French paper, is very well sized, but a 
little too thin for negatives, and more so for positives. 
The above, however, are the best papers with which I 
am acquainted. 
lst Operation—Lodising. 
Take 20 grains nitrate of silver, and dissolve in $ an ounce 
of distilled water in a small glass-stoppered bottle. Take 
also 4 drachms of iodide of potassium, 4 grains of bromide 
of ditto, and dissolve in 3 an ounce of distilled water in 
another glass bottle. 
These mixtures will not spoil by keeping, but ought not 
to be exposed to daylight. 
When wanted for use, drop say 50 drops of the first 
mixture into a glass vessel, then add so many drops of the 
second solution, until the white precipitate which forms is 
re-dissolyed, and the compound mixture becomes clear like 
water. Take a sheet of paper, and having marked with 
pencil one side, that you may know it again, pin it by 
one or two of the corners on to a deal board a little larger 
than the paper ; then holding the board inclined, dip a clean 
large camel’s-hair brush into the compound solution just 
described, and brush the paper smoothly and evenly across 
the sheet, and afterwards from the top to the bottom; the 
greatest care being taken that no part of the paper is omitted 
in brushing it over. 
Dry by hanging the paper up by one corner ; half-a-dozen 
papers may thus be coated at once. When quite dry place the 
papers with the coated face downwards in a large tub of clean 
water, and let them soak in it for twenty-four hours or so, 
according to the heat of the atmosphere ; when taken out and 
dried, by hanging up by the corner, they will be found to bo 
