346 INCREASED NUMBER. 
a repetition or renewed development of organs. When 
the increased number arises from multiplication proper, 
or from repetition, the ordinary laws of alternation are 
not interfered with, but if from chorisis or ‘*‘ dédouble- 
ment,” it may happen that the normal arrangement 1s 
disturbed. 
Without studying the mode of development, it is 
not in all cases possible to tell under which of the 
above categories any particular instance should be 
placed ; hence, in the following sections, except where 
otherwise stated, the cases are grouped according to 
the appearance presented in the adult condition, rather 
than to the way in which the changes from the typical 
condition are brought about. With reference to the 
foliar organs it is necessary to distinguish those cases 
in which there is, from any cause, an augmentation in 
the number of component parts of a whorl, from those 
in which the increase takes place in the numbers of the 
whorls themselves. 
CHAPTER I. 
MULTIPLICATION OF AXILE ORGANS, INFLORESCENCE, ETC. 
By Linné an undue number of branches was desig- 
nated as ‘‘ plica,” from the analogy with the disease of 
the hair known as plica polonica: ‘‘ Plicata dicitur 
planta, cum arbor vel ramus excrescit minimis intertextis 
ramulis, tanquam plica polonica ex pilis, cew instar nidi 
Pice, quod vulgo a genio ortum arbitratur; frequens 
apud nos in Betula, presertim Norlandie, in Carpino 
Scanie, nec infrequens in Pinu.’ 
By some of the older authors this condition was 
called polyclady. In some cases, it would seem to 
1 «Phil Bot.,’ § 274. 
