Deviation 
Diaphragm 
Devia’tion, probable, Galton’s term 
for probable variation. 
Dew-leaves, leaves which slope up- 
wards, so that dew is collected. 
dex’'trad, an unusual modification of 
DEXTRAL=DEXTRORSE (deatra, the 
right hand) ; Dextrin, a substance 
produced during the transformation 
of starch into sugar, said to be of 
two forms :—AcHROODEXTRIN and 
AMYLODEXTRIN ; Dex’trinase, an 
enzyme stated to be present in 
diastase (Wysman); dex’trorse, dex- 
tror’sus (from versus, turned to- 
wards), towards the right hand; 
dex’tror’sum volu’bilis (Lat.), twin- 
ing towards the right; Dex’trose, 
glucose, or fruit sugar, it turns the 
plane of polarization to the right ; 
cf. LEvVULOSE ; dex’tro-ro’tatory, 
turning towards the right. 
di-, dis-, in Greek compounds=two, 
or double. 
Diache’nium (&:, two, +Achenium), or 
Diake’nium =CREMOCARP. 
Diach’yma (4, through ; xvud, a liba- 
tion), Link’s term for MESOPHYLL. 
Diadel’phia (5:,two; d5e\¢ds,a brother), 
a Linnean class having the stamens 
in two bundles or brotherhoods ; 
diadelph’ian, diadelph’ ous, -us, -icus, 
with two groups of stamens. 
diad’romous (da, through; dpdsos, 
course), applied to a fan-shaped 
venation, as in Gingko biloba, Linn. 
diageotrop’‘ic (77, the earth ; tporos, 
a turn), a modified form of geotrop- 
ism, the organs placing themselves 
in a horizontal position, as though 
opposing forces were neutralised ; 
Diageot’ropism, the state just de- 
scribed ; Diagno’sis (yv ors, wisdom), 
a brief distinguishing character ; 
diag’onal (ywvia, angle), a mean 
between two forces, a compromise 
of position; ~ Plane, in a flower, 
any vertical plane which is not 
antero-posterior (front to back) or 
lateral (side to side); ~ Posit/ion, 
one intermediate between median 
and lateral ; ~ Sym’metry, applied 
to the valves of Diatoms when the 
torsion amounts to 180°; Di’agram 
75 
(ypazuy, an outline), see FLroraL 
DiaGRaM ; Diaheliot’ropism (cos, 
the sun; 7pd7os, a turn), growth 
more or less horizontal, under the 
influence of light, as when leaves 
place themselves at right angles 
to incident light; adj., diaheliot- 
rop‘ic. 
dialycarp’ic (d:advw, [disband ; caprds, 
fruit), having a fruit composed of 
distinct carpels; Dialydes’my(deopds, 
a band), the breaking up of a stele, 
into separate bundles, each with 
its own endodermis ; Dialypet’alae 
(wéradov, a flower-leaf), Endlicher’s 
equivalent for the PoLypETaLaE of 
Jussieu;  dialypet‘alous, poly- 
petalous ; dialyphyll’ous (#vA)or, a 
leaf), bearing separate leaves ; dia- 
lysep’alous (+SEPALUM), bearing 
separate sepals; Dial’ysis, the 
separation of parts normally in 
one, especially parts of the same 
whorl ; Dialyste’ly (or7\7, a post), 
a variation of PoLysTELY, in which 
the separate steles remain for the 
most part separate during their 
longitudinal course. 
diamesog’amous (4, through, pécos, 
middle, yduos, marriage), fertiliza- 
tion by the means of some external 
agent, as wind or insects; Dia- 
mesog’amy, the condition just de- 
fined, 
Dian’dria (dts, two, dvip, dvépds, a 
man), a Linnean class with plants 
of two stamens; dian’drian, dian’- 
drous, -rus, (diander), possessing 
two stamens. 
diaph’anous, -ws (did, through, galvw, 
I show), permitting the light to 
shine through; also written dio- 
ph’anus + ; Diaph’ery (¢épw, I bear), 
the calycine synthesis of two 
flowers (Morren) ;_ Diaphragm 
(ppdcow, I enclose), a dividing mem- 
brane or partition, as (1) the con- 
striction in the neck of the nucule 
in Chara, from the inward projec- 
tions of the segments; (2) the 
transverse septa in the stem of 
Eyuisetum or of grasses; (3) the 
layer separating the prothallium 
