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In comparing plant and animal tumors it must bc remembered,
however, that there are certain developmental and I'unctional
characteristics C01- monly used in the differentiation of animal
cancers that are more or less restricted to animals and cannot,
therefore, be carried over and applied to plant tumors. These have
been dealt with in detail by WHITE and BRAUN (1942) and by BLACK
(1949), and will not be considered further here. The most essential
characteristic of being able to grow independently of any
morphogenetic restraint, upon which all of the other diagnostic
features must ultimately depend, is, however, equaHy capable of
expression in neoplasia of a11 higher organisms since it is a
characteristic of the ceH itself. One striking aspect of tumor
genesis is the multiplicity of diverse agencies that are seemingly
capable of accomplishing essentially the same end result. Radiant
energy, irritation, carcinogenic ehemicals, parasitic organisms,
and virus es have all been shown to serve as incitors of tumors in
animals. The effectiveness of these various I'actors in cliciting
tumor formation appears to be a I'unction of the hereditary
constitution of the host. Many of these same agencies have also
beeIl found to be concerned etiologically in the inception of
tumors in plants.
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