NATURE PRINTS 135 
When you think the exposure has been long enough, 
remove the paper from the frame, and you will have 
a beautiful print of the leaf, showing veins and a 
great deal of detail. ‘The paper must, of course, 
be toned and fixed. In this way you can use a 
pleasant hobby to advance your botanical knowledge. 
Gather your finished prints together and store them in 
albums, portfolios, or boxes. You will be astonished 
at the beauty of such prints, and in making and 
naming them you will have learned some useful 
facts. The paper known as “ self-toning ” is simpler 
to deal with than ordinary printing-out-paper 
(P.O.P.) ; it only needs fixing in a solution of hypo, 
an hour or so’s washing, and the “ messy” part of 
the work is done. 
But ordinary P.O.P. and self-toning papers cost 
money, and money is always a consideration with 
young people. Is there no cheaper way of making 
prints of leaves ? Well, there is, and I will tell you 
about it. 
There is a kind of paper known as “ Ferro- 
prussiate.” This is the sort that is used by draughts- 
men in making copies of their drawings. It is far 
less expensive than ordinary P.O.P., and yet it will 
give you splendid blue prints. I have some prints 
of leaves made on this kind of paper by me as I 
write ; they are really beautiful; every detail is 
shown. You can get a supply of “ Ferroprussiate ” 
paper from dealers in artists’ materials and draughts- 
men’s supplies. Perhaps you have some draughts- 
man friend who can give you some odd pieces to 
experiment with. The leaf and paper are put into 
a printing-frame just as with P.O.P., and printing is 
