Cytogamy 



dealbate 



Cytog'amy (ydfj.os, marriage), the 

 union of cells ; Cytogen'esis (-yececrts, 

 beginning), origin and develop- 

 ment of cells ; sometimes written 

 Cytiogenesis ; cytogenet'ic, per- 

 taining to cell-formation; eytog'- 

 enous, having connective tissue ; 

 Cyto'geny = CYTOGENESIS ; Cyto- 

 hy'drolist (vSop, water ; XiJ<rts, a 

 loosing), an enzyme which attacks 

 and breaks up the cell-wall by 

 hydrolysis ; Cytohy'aloplasm ( + 

 Hyaloplasm), the protoplasm of 

 the cell, apart from any granules 

 or foreign matter ; Cy'tolist (Xv<ns, 

 a loosing), an enzyme which dis- 

 solves the cell-wall ; cytolyt'ic, of 

 a ferment so acting ; Cytol'ogy 

 (\6yos, discourse), the science of the 

 cell, its life history, nuclear divi- 

 sions and development ; adj. 

 cytolog'ic, cytolog'ical ; Cytomi'- 

 crosomes (/xi/cpos, small ; crw^ta, a 

 body), the granules or microsomes 

 imbedded in the cell-protoplasm ; 

 Cy'toplasm (TrXaV/ua, moulded), the 

 general protoplasm of the cell 

 (Strasburger) ; Cy'toplast, the cyto- 

 plasm as a unit, in contrast to the 

 nucleus ; Cytopla3t'in, a proteid 

 which apparently forms the bulk 

 of the Cytoplasm ; Cy'tosomes 

 (crtD/xct, a body), Vuillemin's name 

 for the granules of cell-protoplasm ; 

 cytomicrosomes. 



dacryoi'deus (Sfapv, a tear ; 



resemblance), used for pear-shaped 

 fruit, oblong and rounded at one 

 end, pointed at the other. 



dactyli'nus (SaKruXos, a finger), divided 

 like fingers ; Dactylorhi'za (ptfa, 

 root), the forking of roots ; dac'- 

 iylose, dactylo'sua, fingered, or 

 finger-shaped. 



daed'aleous, daed'ahus (Lat. = skilful 

 craft), (1) the apex of a leaf irregu- 

 larly jagged, though not arcuate ; 

 (2) wavy and irregularly plaited as 

 the hymenium of some Agarics ; 

 Daedalench'yma (tyxvfj,a, an infu- 

 sion), tissue made up of entangled 

 cells, as in some Fungi. 



Dah'line, a substance resembling 

 starch from the tubers of the genus 

 Dahlia. 



Dam'mar, a transparent resin from 

 Agathis loranthifolia Salisb., for- 

 merly named Dammara orientalis, 

 Lamb. 



Damp'ing, a cultivator's term for 

 premature decay in plants, especi- 

 ally young seedlings, attributed to 

 excess of moisture. 



Daph'nin, the bitter principle of 

 Daphne Mezereum, Linn. 



Darwin, .see KNIGHT-DARWIN Law. 



Darwinian Curv'ature, the bending 

 induced by the irritation of any 

 foreign substance close to the apex 

 of the root. 



date-shaped, resembling a date in 

 form. 



dasyphyll'ous, -lus (5a<rvs, thick ; 

 <t>v\\oi>, a leaf), (1) thick-leaved ; (2) 

 leaves thickly set ; (3) with woolly 

 leaves. 



Datis'cin, a substance having the 

 appearance of grape - sugar, first 

 obtained from Datisca cannabina, 

 Linn. ; it has been used as a yellow 

 dye. 



Datu'rine, an alkaloid of Datura 

 Stramonium, Linn. 



Daugh'ter-cells, young cells derived 

 from the division of an older one, 

 the mother-cell ; ~ Chro'mosome, 

 a secondary chromosome, derived 

 from division of the original ; ~ 

 Skein, stages in nuclear division 

 when the chromatin is more or less 

 in a reticulate condition ; further 

 distinguished by some observers 

 into " loose " or " close "; ~ Spore , a 

 spore produced immediately from 

 another or upon a promycelium ; ~ 

 Star, one of the groups of chromatic 

 filaments at the poles of a dividing 

 nucleus ; the two together with the 

 connecting spindle constitute the 

 " Dyaster " stage. 



Day-position, the pose assumed by 

 leaves during the day, in contra- 

 distinction to that taken for the 

 night, 

 deal'bate, dealba'tus (Lat., white- 



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