APPENDEX .C, 
PHOTOGRAPHY. 
As by far the greater proportion of travellers who start on their journeys 
thoroughly acquainted with the art, I will here give the formule which were 
written out for me by my friend Mr. Browne, and which did me good service 
all through my trip. I am sure. they will be found most useful to those who 
desire to take views of what they see, and are, like myself, unacquainted with 
photography. 
THE GLASS, 
Take off the sharp edges by rubbing them against each other. Clean with 
water and wipe dry, then rub with alcohol and flannel, and polish with a silk 
uster. Brush off the dust with a camel’s-hair brush. 
THE COLLODION. 
Pary’s gun-cotton, 73 grains to the ounce of mixture, 
NEGATIVE BATH. 
wate witeele Of Miver. 65 45 grains. 
Water 
Add 5 grains of iodide of silver, or let a coated plate remain in the bath over- 
night; make it very slightly acid with pure nitric acid, Filter. q 
Cae ee ee ee Rea eae Ow ee eo oe 
| In warm weather add equal parts of cold water, to reduce the strength of the j 
