re often associated with the
production of different forms from those characteristic of organs
developed in succession, and, in consequence, arranged spirally. In the
case of simultaneous development we meet with a repetition of whorls,
as in what are termed hose-in-hose flowers (flores duplicati,
triplicati, &c.), and also with cases of peloria. In instances where the
organs are formed successively in spiral order, we meet with such
changes as median prolification, petalody, and phyllody. All these are
alterations which we might anticipate from the activity of the growing
point being checked at a certain stage in the one case, while it is
continuous in the other. This relationship between the definite and
indefinite modes of growth and the form of the several organs of the
flower, is more constant in reality than it may appear to be from a
perusal of the lists of genera in the foregoing pages, in which it was
not possible to show sufficiently well the comparative frequency of any
given changes in individual plants. Had it been possible to give
statistics setting forth the frequency of certain deviations in plants
or groups having a particular organisation, as compared with the rarity
of their occurrence in other plants of a different conformation, these
co-relationships would have been rendered much more evident. A hundred
different plants, for instance, may be named in any particular list, of
which fifty shall be of one type of structure, and the remainder of
another. And the co-relative changes in each fifty may appear to be
evenly balanced, but so far is this from being the case, that the
frequency of the occurrence of a particular change, in one species in
the list, may be so great as far to exceed the instances of its
manifestation in all the rest put together. This difficulty is only very
partially obviated by the addition of the * to signify especial
frequency of occurrence of any given malformation in the plants to whose
names it is affixed.

=Compensation.=--But little further need be said on this head. An
atrophied condition of one part is generally associated with an
hypertrophied condition of another, and scarcely a change takes place in
one direction, but it is associated with an inverse alteration in some
other. This principle is not universal, and its application must not be
unduly strained. It requires specially to be considered in reference to
differences in the degree or kind of functional activity ex