16 



ON THE FEKTILIZATION 



interna 



„.il it becomes almost vertical at the internal limit of the zone of male flowers 



The central bractcal area is of a pale yellowish-green colour, the zone 



IV. ft 21) 



, 7.1 . ftJS. and tl,u- enclosing bracts is whitish, and the rest of the surface of a pal 

 t ' ZTonally of a bright rose colour, due to the pigmented cells of the styles and 



iata of the gallflowers. The cavity of the receptacle at this stage is devoid of fluid 



It, : ,temal surface of the wall smooth and even, and the oraries of the gall-flowers arranged 



utmost in twowws, due to some of them being sessile and others shortly 



p«dioellate (Plate IV, figs. 22, 25). 



in a sin 



1«. row, or at 





—Characters of gall-receptacles after access of insects, but before maturation 



The following data show the conditions present at various periods prior to maturation 

 1. Receptacle 16 days after access of insects to the cavity — 



External diameter 2**2 



Thick new of wall 0*24 



Depth of gall-flower stratum 0"'19 



■ 



; ho inner Bin fare of tin; wall was no longer quite smooth, but had begun to show a 



*>rioi of « lrvatimis and depressions, and the ovaries of the gall flowers were already arranged 



in three or four superimposed strata. The cavity was still empty. 



2. Receptacle to which ii lects had recently gained access — 



External diameter 2' /# 5 



1 hameter of area of male flowers and ostiolar bracts 0"'91 



i readth of zone of male ilowers . . . . 0"*18 



I >epth of ostiolar plug ^ 



Depth of the solid portion beneath the level where the bracts 



0"-38 



were 



loosened, due to the corpses of insects interposed between them . . 0"'16 



Average thioknest of the walls 



Thiokussa of stratum of gall-flowers 



0"-39 



0"-27 



- tl;;;;^l;;:t:tdT?r r ^ p r nt in three or four rows - t ^ ^ «**** *» 



« ; oi ::;::":/ ts flewt: outer pe r nth were be « to ^ The 



e stratum of gallflowers was no longer composed of the stigmata, but of 



T • ^^"5* CUp ° la8 . ° f the ~> »d the eavitv of the 



full of fluid The colour of the interior was faint madder brown 

 ■tigmatu and slightly coloured ovaries. 



Receptacle at a considerable period after the 



Kxternal diameter 



IS t *f~ °! i*^ - *• -it, 



> 



receptacle was 

 due to the deeply tinted 



access of insects 



3"3 



rsadth of zone of male flowers °"' 33 x °"* 58 



(T3 



Breadth of periphenl zone of 11 fl 



bickness of wall of receptacle ^ ^^ *" ° f the Cavit r • <>-54 to 0"-4 

 Depth of stratum of gall-flowers . ] °"' 37 



0^*35 



The peripheral area of galhflowers arrm^ si. 

 «* 1 d of the latter in place of form il 2^1 "T ° f "* fl ™ ™« P-jected above 



o * groove. I he cavity was full of fluid. 









