O.V THE FERTILIZATION 



t 



I 



»W 



i pr 





■ 



>lution 



mug off from it in va 

 it hi mies separated 



directions (Plate V 



j 



S- 



11), and that 



in th 



e 



a 



? 



prominent dilation 



) 



Ml 



ko cell 



radiating 



fro n 



it 



Be this as it 



at this sta 



© 



there 



is 



a series of 

 prominent 



■ 



lotted pcriphcra 



d 



ones anting 



of tho •>■• 



readily •♦•I'* 



11 



1 



>-sac, and two or more 

 from it laterally and clasping the adjacent surfaces 



the outer surface of the embry 



be ig 



iiff«rnt!y n-oi; 



ruble from the cells 

 rues recognisable 



y 



ft r 



At thi 

 site o 

 parati 



period 



apex of the embry 



contact with the 



is still 



tral one, however 



j 



has 



taken place 



> 



to its 



staining 



'© — 



rest of the sac- wall (Plat 



> 



tu inc rei 



Inmate 

 the peripheral cells 



more and more in prominence 



pressing 



ng- 

 down 



13) 



The central cell continues 



j 



ginatin 



> 



apparently 



l» netrating tl 



apex of the embry 



> 



and 



7 



at the same time 



> 



Out 



out into long horn-like processes 



with dilated bases adherent to 



f the central 



ie *i. lei ot u,c eeiunu uno, a.^ "^i 14 j ° 



ke the bawl cues, are nucleate (Plate V, figs. 12, 14, 15) 



d frequently showing secondary dilations farther out, which 



From their position and relation 



<> n< ifl 



boarimr structures, these lateral pi 



appear to be specially adapted to fix the 



Html U u it presses down on the apex of the embryo 



a p t . of free nil formatio 

 In lion n the part of the contents 



or rather, perhaps, of re] 



Subsequently, as the i 

 uvescence followed by 



ult 



of the central cell, a series of three cells arises within it 



linear series (Plato V, fig. 12) 



The two first of these appear to play the part 



rram 1 m linear series ^riaio v, ug. i*j. *m *w*/ ^^ ^ — — -rr — ~ r~v — r— 



of a au-pen- r, the basal one appearing to be adherent above to the membrane of the mother 



cell, am 



par< mil m;i 



len 



it t 



the under surface of the apical cap of the nucellar 

 Hie di tal or inf rior cell swells up, becoming, first, more or less hemispherical 



fore through 



1 then br adly clavato 



» 



and the d 



protoplasmic contents give origin by free 



livision t an 



firregate 



nucleate protoplasts constituting the pro-embryo (Plate ., 



!l 



1 



H, 15). 



At this stage the central cell and its contents measure 



about 0-033x0-016 



nun 



ubsequcutlv, as increased growth in the secondary cells 



goes on, they come to press 



upon the interior of the walls of the parent one, and its outlines become undistinguishable 





Tl 



fluid witl 



At 



n 



ie 



remains apparently structurally unaltered for a short time after the 

 e receptacle, merely increasing in capacity, due to accumulation of 



yd 



ts to 



At a period wl 



the 



mbry 



cell already has 



beg 



to enlarge 



j 



its centra] portion to press down on and adhere to the apex of the sac, the latte 



continues 



» 



i-' 



in 



some cases at all events, to retain its original, 



gle 



, large nucleus (Plate V 



1-U 



A 



ttl 



later 



ch 



however, this disappears, and is replaced by a large number 



y 



of 



8Qi 



the sa< and at 

 seems to o< cur 



dary ones, which are scattered over the inner surface of the wall of 



same time an increase in the substance of the network of 



ytopl 



asm 



( 1 late V, figs 



9 



) 



10) 



So long as 



the 



tho apex of the sac, the latter is readilv seoarabl 



mbryogenic cell merely dep 



reagents 



der the infl 



of 



the ap 



ca \ ) 



tl 



the nucellar parenchyma, but after adhesion or actual perforat 



of 



apex h * occurrt this 



is no longer 



the 



case 



» 



the sac adheres so firmly to the 



that on several occasions I have been able to detach them from the rest of the 



ovule en masse 

 being drawn 



by tearing 



off the micropylar extremity, the lower portio 



portions from one another 



out of the inferior half of the ovule in the process of 



removing 



of the 



lut 



Time has not yet sufficed for an examination of t 



of the embryo after 



to proceed next to a de 

 I >wers and their seeds. 



this stage h 



been reached, and 



> 



ha 



of the sac 

 the two 

 ie details 

 therefore 



ption of certain of the characters presented by the mature 



