PRESERVATION OF FERNS FOR THE HERBARIUM. 89 
fronds of a species, one should be placed so as to show 
the upper surface and the other to exhibit the fructi- 
fication. If the two cannot lie on one sheet, two dif- 
ferent ones must be devoted to display their different 
surfaces. Where there are two kinds of fronds on one 
fern the same rule holds good : if you can dispose the 
two side by side, it is desirable that you should do so ; 
if they are too large for that, then the one must follow 
the other on successive sheets. Mr. Moore recommends 
that the specimens should be so far moveable as to 
admit of being taken in the hand for examination ; 
this may be managed without running the risk of the 
delicate branches being broken, by every jolt given to 
the herbarium, if cardboard straps be employed, which, 
being passed through a little slit on either side of the stem 
of the fern in different places, secure the frond firmly 
to the sheet, and yet admit of being removed and re- 
placed at pleasure. They may also be secured by thread 
ties or gummed straps, or left loose and enclosed in 
an enveloping sheet of still larger paper. In all cases 
they should be fully labelled, the locality where the fern 
grew, and the date of gathering it, being carefully stated. 
The sheets containing the dried ferns may be placed in 
the shelves of a cabinet, in drawers, or between the 
boards of portfolios, as the collector pleases, but in any 
of the positions he must take good care to shield them 
from dust, damp, and careless violence. 
