136 THE OPEN BOOK OF NATURE 
best carried on in good sunlight. The paper is green, 
but it prints blue, and it may be removed from the 
frame when the details of the leaf are distinctly - 
visible. After printing, the paper is placed in cold 
water, when it soon turns bright blue, and the details 
become more distinct. The print should be washed 
in several changes of water until there is no yellow- 
ness about it ; then it may be allowed todry. When 
dry, it is ready for naming and its proper place in 
the collection. 
You can make Ferroprussiate paper yourselves if 
you like. This is how to do it. Get from the 
chemist 40 grains of ferricyanide of potassium and 
1 drachm of ammonio-citrate of iron in separate 
packets. Dissolve the ferricyanide in 5 drachms 
of water, and the ammonio - citrate in a similar 
quantity. Keep the solutions apart until required 
for use. When you want to prepare your paper, 
you must work at night by artificial light. Have 
some nice, smooth-surfaced, but not glazed, paper 
ready ; mix your two solutions, stir them well, and 
strain the mixture through muslin. You will then 
have a grecn solution, which you must spread nicely 
and evenly with a wide brush over one surface of 
your paper. Let the paper dry in the dark, and 
keep it under cover until you wish to use it. _ Print 
as already directed. I need hardly say the solution 
is not good to drink, and it should not be left care- 
lessly about. 
If you have the good-fortune to possess gardens, 
why not grow some wild flowers in them? I have 
a nice corner of my own garden devoted entirely 
to wild flowers of the rarer kinds. When I want to 
