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underground stem. This may take the shape of a bulb, 
or a tuber, or a rootstock; but in any case it shows you 
at once that it is a little storehouse of food. 
A collection of the different kinds of underground 
stems which serve as storehouses for the early-flowering 
plants would be quite as interesting to work over as a 
collection of plant packages. 
Di PFERENT “BUILDING PLANS 
HIS morning let us take a stroll in the woods with 
the idea of noticing the different building plans 
used by the early flowers. 
First we will go to the spot where we know the trail- 
ing arbutus is still in blossom. Pick a spray, and tell 
me the plan of its flower. 
“There is a small green cup, or calyx, cut into five 
little points,” you say; “and there is a corolla made up 
of five flower leaves.’ 
But stop here one moment. Is this corolla really 
made up of five separate flower leaves? Are not the 
flower leaves joined in a tube below? If this be so, you 
must say that this corolla is five-lobed, or five-pointed, 
not that it has five flower leaves. 
“ And there are ten pins with dust boxes, or stamens.”’ 
Yes, that is quite right. 
“And there is one of those pins with a seedbox below, 
one pistil, that is, but the top of this pistil is divided 
into five parts.” 
