130 The Botanical Gazette. 
EXPLANATION OF PLATE X. 4 
Figure 1. Passiflora Pfordti; Véchting's dynamometer attached to tens 
B, short arm, c, long arm, D, pointer, z, hook, F, scale, L, curve of longarms 
] ; ora cerulea; a, growing tip of shoot with undeveloped 
drils, 8, tendril slightly sensitive and nutating, c, tendril capable of coiling ® 
The limitation of the term “spore.” 
CONWAY MAC MILLAN. 
Every one who has attempted to define his tems of oa} 
use has probably met with the same experience that & 
writer might describe. Words, easily definable at first, 
come more and more vague as their implication is more™’ 
understood. In view of the scantiness of botanical t® oe 
ology, although it is one of the richest of scientific vor 
laries, there is great need that the import of commo? a 
should be examined with much care to avoid thee i 
over-, or under-definition. Every work that appear " 
some new and generally barbarous verbal technicalit! ; 
tend rather to cloud than to clarify perception, For € 
in that most excellent little compendium on the crypt : 
plants, lately published from Bennett and MurayS 
grieved to find that the word ‘‘sperm,” properly ae arly 
plant, as in animal, biology, is diverted to a pecu 
m of the pe 
h prefera? ‘i 
of the 
> | 
en 
‘ 
i. a 
co 
nomena of development, strictly analogous, i 
homologous. 
time, but simply to show how under the gener 
are a number of ideas that clear thinking dem@? 
kept separate. In the first place it may pape 
