crop-yielding trees which we can use. This will permit us to use
entirely different kinds of land from that now considered best for
agriculture. The natural necessities for plant growth, I believe, are
heat, moisture, sunlight and fertility. Now they are not all the
limiting factors with man, because man adds the fifth, the arbitrary
fact of arability, and that right away bars out about half of the
fertile earth, because when we insist on heat, light, moisture,
fertility _and arability_, we leave out that rough half of the earth
equally fertile, idle, subject only to the work of the forester, who
will give us a forest about 1999. It might just as well be planted with
a host of crop-yielding trees, the walnuts, hickory nuts, pecans,
persimmons, mulberries--and the list is very long. There are at the
present time in use in Mediterranean countries twenty-five crop-yielding
trees other than the ordinary orchard fruits. I am told that they have
oak trees there which yield an acorn that is better than the chestnut. A
pig will fill himself with acorns on the one hillside and with figs on
the next hillside and then lie down and get fat. We are too industrious,
we wait on the pig; I want the pig to wait on himself.

But who is going to breed these things? These crop yielding trees? A
gentleman told us this morning that he was not nervous, that he could
watch a hickory tree grow, and stated that he had forty acres of land
and was breeding trees for fun. Here is Dr. Morris, who is having a
delicious time doing the same thing. We should not have to depend on
enthusiasts who are working for fun; we must not depend on such sources
for the greatest gifts in the line of food production that man can
imagine. This work should be done by every state in the Union. I believe
that it is capable of proof that we can get just as much yield from a
hillside in untilled fruit and nut-yielding trees, as we can from
putting that same hillside under the plough and getting wheat, corn,
barley, rye and oats and a little grass once in a while. It will make
just as much pig or just as many calories of man food from the tree
crops as it will make under the plough. And under the plough that
hillside is going down the stream to choke it and reduce the hillside to
nothing.

We have three classes of land. The first class is the level land, which
belongs to the plough now and for all time. The third class, which is
the unploughable steep mountain and hill l