cable, in the proportion
of two sugar pines to one yellow pine."

In the fir belt, where sugar pine and fir are the principal species,
the fir should be cut clean wherever possible and sugar pine should
be relied upon for the future forest.

"On all lands, the Douglas spruce, white fir and incense cedar
should be cut whenever possible, and chutes, skidways and bridges
should be constructed from the two last named species."

The following specific instructions are issued for marking timber
on National Forest sales in the sugar pine-yellow pine type:

"Owing to the large size of the trees, marking in this type of
forest should be done with special care, since a slight mistake
involves a comparatively large amount of timber.

"On nearly all of the lands included in this type the ground is
now but partly and insufficiently stocked with young timber, the
areas of forest are constantly becoming more accessible to markets,
and there is every indication of a strong future demand at greatly
increased prices. On nearly every tract, a second cut can be made
within thirty years. All marking under present sales should be
done strictly with reference to two points:

"1. Stocking the cut-over land as fully as possible with sugar and
yellow pine.

"2. Securing a second cut within thirty years.

"All cutting should be done under the 'selection system,' which
requires a careful choice of the individual trees to be removed.
Fixed diameter limits and the leaving of any specified number of
seed trees per acre can be very largely disregarded.

"The condition of every sugar and yellow pine on the sale area
should be studied closely to determine whether that tree will be
merchantable thirty years hence, by which time a second cut is
probable. As a rule the trees which will remain merchantable for
another thirty years should be left. Suppressed and crowded trees
which cannot develop should be removed. Under this system of marking,
ordinarily about one-half of the present stand of merchantable
pine would be left uncut. Will it pay?

"On areas where practically all of the pine is over-matured and
would be cut under the rule given above, a sufficient stand must be
left to reseed thoroughly the cut-over land. This requires not less
than four full seed-bearing trees, at least 25 inches in diameter,
per acre. The strongest and thriftiest trees available should be
selected for this purpose, but not less than the number specified
must be