Signs 
Sinker 
Signs, arbitrary symbols for shortly 
stating certain facts; a selection of 
those more generally used, is given 
in Appendix A. 
Sil'icle, Silic'ula, Sil'icule (Lat., a 
little husk or pod), (1) a short 
siliqua, not much longer than wide; 
(2) = Carroctonium of Algae. 
silicic’olous (silex, silicis, a flint, colo, 
I inhabit), used of Lichens which 
grow on flints; Silicifica’tion, the 
deposition of silica in tissues; 
Sil’ico-cel’lulose (+ CELLULOSE), the 
condition of tissue when silex is 
intimately blended with it as 
in EHqwsetum hyemale, Linn. 
(Tschirch). 
silic’‘ulose (+ SiLicuLa), having 
silicles as fruits, or resembling a 
silicle. 
Sil’iqua (Lat.), Silique, pr. Si-leek’, 
(1) the peculiar pod of the Cruci- 
ferae, two valves falling away 
from a frame, the RepLum, on 
which the seeds grow, and across 
which a false partition is formed ; 
(2) ¢ by Blair employed for 
Legume; Siliquel’la, a subordi- 
nate part of a fruit such as the 
poppy, consisting of a carpel with 
two extended placentas; siliq’ui- 
form (forma, shape), shaped like 
a silique; sil’iquose, siliquo’sus, 
when the fruit is a silique, or 
resembles one. 
sil’ky, sericeous. 
Sil’va = SyLva. 
Sil’ver-grain, the appearance in radial 
longitudinal section of exogenous 
wood, especially of oak, due to shin- 
ing plates of the medullary rays. 
sil’very, having a lustre like silver. 
sim‘ilary Parts, { elementary organs 
or tissues (Lindley). 
similifio’rous (similis, like, flos, floris, 
a flower), applied toan umbel when 
its flowers are all alike; Simili- 
sym’metry (+ SymMeETRY), when the 
two halves of a Diatom valve are 
similar (Schuett) ; consimilarity. 
sim’ple, sim’plex, of one piece or 
series, opposed to compound, ~ 
Fruits, those which result from 
9 
the ripening of a single pistil; ~ 
Gland, a single cell containing a 
special secretion; ~ Gonid’iophore 
(+ GonIDIOPHORE), a single hypha 
as in Penicillium; ~ Hairs, not 
compound or branched, the pro- 
longation of a single epidermal 
cell; ~ Inflores‘cence, a flower 
cluster with one axis, as a spike, 
spadix, or catkin; ~ Leaf, ap one 
blade, with incomplete segmenta- 
tion; ~ Nuta’tion, nutation in one 
direction only ; ~ Pis’til, consisting 
of one carpel; ~ Pit, ~ Pore, with 
only a slight enlargement at the 
centre, where it meets the neigh- 
bouring cell; ~ pri’mary Root, a 
tap-root; ~ Spor’ophore, a single 
hypha or its branch, in German, 
Fruchtfaden ; ~ Stem, a stem which 
is unbranched. 
simplicis’simus (Lat.),entirely simple. 
simulta’ neous (simutaneus, Late Lat., 
at the same time) Whorls, when 
the members are of the same age 
and developed at the same time. 
Sinal’bin, mustard oil from Brassica 
alba, Boiss., formerly termed 
Sinapis alba, Linn., whence the 
name. 
Sina’grin, or Sin'igrin, a glucoside 
occurring in the seeds of Brassica 
sinapoides, Roth, formerly termed 
Sinapis nigra, Linn., the origin of 
the name. 
Sina’pin or Sina’pisin, an alkaloid 
from Brassica alba, Boiss. (Han- 
bury & Fluekiger). 
sin’gle, used of a flower which has 
only one set of petals, as opposed 
to double or any approach to 
doubling. 
sinis’trad =sINISTRAL. 
sinis’tral, sinis’trorse, sinistror’sus, 
turned to the left; ¢f. DEXTRORSE, 
and Appendix C. 
Sin/istrin (sinister, the left), a 
carbohydrate from Urginea and 
other bulbs, formerly regarded as a 
gum. 
Sin’ker, the secondary roots of 
Mistleto, Viscwm album, Linn., 
forming laterals which strike 
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