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 (deztra, the 
right hand) ; Dextrin, a substance 
produced during the transformation 
of starch into sugar, said to be of 
two forms :—AOCHROODEXTRIN and 
AMYLODEXTRIN ; Dex’trinase, an 
enzyme stated to be present in 
diastase (Wysman); dex’trorse, dea- 
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. LEVULOSE ; dex’tro-ro’tatory, 
turning towards the right. 
di-, dis-, in Greek compounds=two, 
or double. 
Diache’nium (61, two, +Achenium), or 
Diake’nium = CREMOCARP. 
Diach'yma (6:4, through ; ya, a liba- 
tion), Link’s term for MESoPHYLL. 
Diadel’phia (d:,two; d5eA¢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; dpdsuos, 
course), applied to a fan-shaped 
venation, as in Gingko biloba, Linn. 
diageotrop’ic (77, the earth ; tpo7os, 
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@o.s, 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 
(ypaupy, an outline), see FLoRAL 
DiaGram ; Diaheliot’ropism (#cos, 
the sun; 7zpd7ros, 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 (diadvw, [disband ; xapros, 
fruit), having a fruit composed of 
distinct carpels; Dialydes’my(dec pds, 
a band), the breaking up of a stele, 
into separate bundles, each with 
its own endodermis ; Dialypet’alae 
(wéradoy, a flower-leaf), Endlicher’s 
equivalent for the PoLyPEraLaE of 
Jussieu;  dialypet’alous,  poly- 
petalous ; dialyphyll’ous (@v\)ov, a 
leaf), ), bearing se separate leaves ; dia- 
lysep’ alous (+SrPaLum), bearing 
separate sepals ; Dial’ysis, the 
separation of parts normally in 
one, especially parts of the same 
whorl ; Dialyste’ly (c77\7, a post), 
a variation of POLYSTELY, in which 
the separate steles remain for the 
most part separate during their 
longitudinal course. 
diamesog’amous (dia, through, péoos, 
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 (éls, two, dvyp, dvdpds, a 
man), a Linnean class with plants 
of two stamens; dian’drian, dian’- 
drous, -rus, (diander), possessing 
two stamens. 
diaph’anous, -us (dd, through, dalvw, 
I show), permitting the light to 
shine through; also written dio- 
ph’anus {; Diaph’ery (pépw, I bear), 
the calycine synthesis of two 
flowers (Morren) ;_ Di’aphragm 
(ppdoow, 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 
Equisetum or of grasses; (3) the 
layer separating the prothallium 
