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14.

at the time they are moved, and the program to be fall wed later:
if spaced closely a second transplanting is necessary, six 6 x 6
inch spacing is required during the last few months before the trees
are ready to be transferred to permanent locations in the field.

Fortunately, Cinchona seedlings, if properly grown and "hardened off", transplant very readily, even when moved with bare roots.

Grafting. The technique at present employed in Guatemala is
that which has been developed by Jorge M. Benitez, Plant Propagator
of Experimental Plantations Inc. at Finca El Naranjo, Chicacao -
principal base of experimental Cinchona cultivation in this republic. It differs slightly from standard practice in Java if one
can judge by published descriptions of the latter.

The essentials of grafting seem to be these: stock plants
(invariably of the species pubescens or succirubra) must be strong
and vigorous, with stems one-half to three-quarters of an inch in
diameter at the ground. Scions must be of sound, half-ripened wood.
And the work should be done in damp weather if best results are
expected.

In other words, the principles are the same as with other
trees, and are familiar with experienced horticulturists. Fortunately,
trees of the genus Cinchona are not difficult to propagate by
grafting. The percentage of success varies, however, with different
varieties, the strong-growing hybrids such as those known in
several countries as "robustas" being much easier to graft than
the more delicate Ledgers.

Young trees in vigorous growth provide better scions than
older trees. Blossoming wood should not, of course, be used. The
scions should be about four inches in length, and of the thickness