No More Learning

But although these oaks almost invariably die if the pines are not cut
down, it is probable that they do better for a few years under their
shelter than they would anywhere else.

The very extensive and thorough experiments of the English have at
length led them to adopt a method of raising oaks almost precisely
like this which somewhat earlier had been adopted by Nature and her
squirrels here; they have simply rediscovered the value of pines as
nurses for oaks. The English experimenters seem, early and generally,
to have found out the importance of using trees of some kind as
nurse-plants for the young oaks. I quote from Loudon what he describes
as "the ultimatum on the subject of planting and sheltering
oaks,"--"an abstract of the practice adopted by the government
officers in the national forests" of England, prepared by Alexander
Milne.

At first some oaks had been planted by themselves, and others mixed
with Scotch pines; "but in all cases," says Mr. Milne, "where oaks
were planted actually among the pines and surrounded by them [though
the soil might be inferior], the oaks were found to be much the best. "
"For several years past, the plan pursued has been to plant the
inclosures with Scotch pines only [a tree very similar to our pitch
pine], and when the pines have got to the height of five or six feet,
then to put in good strong oak plants of about four or five years'
growth among the pines,--not cutting away any pines at first, unless
they happen to be so strong and thick as to overshadow the oaks. In
about two years it becomes necessary to shred the branches of the
pines, to give light and air to the oaks, and in about two or three
more years to begin gradually to remove the pines altogether, taking
out a certain number each year, so that, at the end of twenty or
twenty-five years, not a single Scotch pine shall be left; although,
for the first ten or twelve years, the plantation may have appeared to
contain nothing else but pine. The advantage of this mode of planting
has been found to be that the pines dry and ameliorate the soil,
destroying the coarse grass and brambles which frequently choke and
injure oaks; and that no mending over is necessary, as scarcely an oak
so planted is found to fail. "

Thus much the English planters have discovered by patient experiment,
and, for aught I know, they have taken out a patent for it; but they
appear not to have discovered that it was discovered before, and that
they are merely adopting the method of Nature, which she long ago made
patent to all. She is all the while planting the oaks amid the pines
without our knowledge, and at last, instead of government officers, we
send a party of woodchoppers to cut down the pines, and so rescue an
oak forest, at which we wonder as if it had dropped from the skies.

As I walk amid hickories, even in August, I hear the sound of green
pignuts falling from time to time, cut off by the chickaree over my
head. In the fall, I notice on the ground, either within or in the
neighborhood of oak woods, on all sides of the town, stout oak twigs
three or four inches long, bearing half a dozen empty acorn-cups,
which twigs have been gnawed off by squirrels, on both sides of the
nuts, in order to make them more portable. The jays scream and the red
squirrels scold while you are clubbing and shaking the chestnut trees,
for they are there on the same errand, and two of a trade never agree.
I frequently see a red or gray squirrel cast down a green chestnut
bur, as I am going through the woods, and I used to think, sometimes,
that they were cast at me.
In fact, they are so busy about it, in the
midst of the chestnut season, that you cannot stand long in the woods
without hearing one fall. A sportsman told me that he had, the day
before,--that was in the middle of October,--seen a green chestnut bur
dropped on our great river meadow, fifty rods from the nearest wood,
and much further from the nearest chestnut tree, and he could not tell
how it came there. Occasionally, when chestnutting in midwinter, I
find thirty or forty nuts in a pile, left in its gallery, just under
the leaves, by the common wood mouse (_Mus leucopus_).

But especially, in the winter, the extent to which this transportation
and planting of nuts is carried on is made apparent by the snow. In
almost every wood, you will see where the red or gray squirrels have
pawed down through the snow in a hundred places, sometimes two feet
deep, and almost always directly to a nut or a pine cone, as directly
as if they had started from it and bored upward,--which you and I
could not have done. It would be difficult for us to find one before
the snow falls. Commonly, no doubt, they had deposited them there in
the fall. You wonder if they remember the localities, or discover them
by the scent. The red squirrel commonly has its winter abode in the
earth under a thicket of evergreens, frequently under a small clump of
evergreens in the midst of a deciduous wood. If there are any nut
trees which still retain their nuts standing at a distance without the
wood, their paths often lead directly to and from them. We therefore
need not suppose an oak standing here and there _in_ the wood in order
to seed it, but if a few stand within twenty or thirty rods of it, it
is sufficient.

I think that I may venture to say that every white pine cone that
falls to the earth naturally in this town, before opening and losing
its seeds, and almost every pitch pine one that falls at all, is cut
off by a squirrel, and they begin to pluck them long before they are
ripe, so that when the crop of white pine cones is a small one, as it
commonly is, they cut off thus almost every one of these before it
fairly ripens. I think, moreover, that their design, if I may so
speak, in cutting them off green, is, partly, to prevent their opening
and losing their seeds, for these are the ones for which they dig
through the snow, and the only white pine cones which contain anything
then. I have counted in one heap, within a diameter of four feet, the
cores of 239 pitch pine cones which had been cut off and stripped by
the red squirrel the previous winter.

The nuts thus left on the surface, or buried just beneath it, are
placed in the most favorable circumstances for germinating. I have
sometimes wondered how those which merely fell on the surface of the
earth got planted; but, by the end of December, I find the chestnut of
the same year partially mixed with the mould, as it were, under the
decaying and mouldy leaves, where there is all the moisture and manure
they want, for the nuts fall fast.