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HETEROMORPHY. 
THERE are certain malformations that have little in 
common beyond this, that they cannot readily be 
allocated in either of the great groups proposed by 
writers on teratology. There are also deformities 
which, unlike the majority of deviations from the 
ordinary structure, are absolute and not relative. 
While the latter are due to an exaggeration, or to an 
imperfection of development, or, it may be, to a par- 
tial perversion in organization, the former differ from 
the normal standard, not merely in degree, but abso- 
lutely. This is often the case when disease or injury 
affects the plant; for instance, in the case of galls 
arising from insect-puncture the structure is rather a 
new growth altogether, than dependent on mere hy- 
pertrophy of the original tissues. These absolute 
deformities arising from the causes just mentioned 
belong rather to pathology than to teratology strictly 
so called; but, under the head of deformities, may be 
mentioned sundry deviations not elsewhere alluded to. 
CHA P*RE-Re Ag 
DEFORMITIES. 
Tar special meaning here attached to the term 
deformity is sufficiently explained in the preceding 
paragraph ; it remains to give a few illustrations, and 
to refer to other headings, such as Heterotaxy, Hyper- 
