PART Tir. 
ALTERATIONS OF POSITION. 
NECESSARILY connected with changes in the arrange- 
ment of organs are similar alterations in their position ; 
so closely, indeed, that but for convenience sake, it 
would be unnecessary to treat them separately. There 
are, however, some anomalous developments affecting 
the relative position of organs that could hardly be 
treated of under any of the preceding paragraphs. 
There are, also, certain rare instances where an organ 
is not so much displaced as misplaced ; that is to say, 
it is developed on or from a portion of the plant, which 
under usual circumstances does not produce such an 
organ. In the former instance, the altered position is 
due to or coexistent with other changes, but in the 
latter case the new growth may spring from organs 
otherwise in nowise different from ordinary. The word 
Displacement is here used to signify the unusual posi- 
tion of an organ; while Heterotaxy may serve to in- 
clude those cases where a new growth makes its 
appearance in an unwonted situation, as, for instance, 
a leaf-bud on a root, &c. Prolification is also included 
under this heading, the unusual position of the buds 
in these cases being of graver import than the mere 
increase in number. Alterations in the position of 
the sexual organs are spoken of under the head of 
Heterogamy. 
