_Multiplying Negatives and Collodion on Paper._--As I am desirous of
printing a large quantity of copies of a glass negative in my possession, I
shall be obliged by any hints as to the best method of multiplying such
negative, so as to guard against an accident from breakage.
I should also feel obliged for any hints upon the use of collodion applied
to glass, paper intervening; so that the paper may be afterwards removed
from the glass, and used as a negative. I have heard of much success in
this way, but am at a loss to know the best mode of operation.