Fig. 5.
Fig. 6.
Fig. 7,
Fig. 8.
Fig. 9.
Fig. 10.
Fig. 11.
Fig- 12.
Fig. 13.
Fig, 14.
Fig. 15.
Fig, 16.
i-'ig. 17.
Fig. 18,
K g . 19.
Fig. 21.
Fig, 22.
Fig. 23.
Fig, 24,
Fig, 25,
Fig. 26.
Fig, 1.
Fig- 2.
DESCBIPTION OP
Highly developed rudimentary female apparatus of a tdtale flower . x 25
State of stataens iu the male flowers of mature reoeptacles to wliioh insects have not
gained access, bat in wliieb, a covtaia amouut of evolution lias oeourred beyond the
stage present at t!i9 normal period for access, sliowing a certain amount of development
of tbe antlier-lobea.
Transverse section tlirough au antbei'-lobe of such, a stamen, sliowing masses of
pollen-tetrads, tapetal cells, and stratum of fibres x 119
Isolated poUeu-tetrads from sucb, a stfimeu x 690
Mature polLen-grains staiued with picrooarmine, showing nuclei x 690
Sheathing bract of a male flower at period for aocess of insects to the receptacle.
Mature pollcn-gi'ain, fresh x 850
Various appearances presented by pollen-grains in one per cent, solution of cane sugar . x 850
Grerminatiug pollen-grains from caitiTOtions on the stigmatic surfaces of receptacleB . . x 690
Dittu ditto ditto ditto . . X 500
Germinating pollen-grains fi'om one per oent solution of cane sugar x 690
Ovule of a gall-flower from a receptacle shortly after access of iusects, showing
iatranucellar site of insect ovum ; stained with picroaarnn'ne x 42
Apes of similar ovule, showing tendency to formation of au apical cap in the nucellar
pai'enchyma x 119
Portion of a similar ovuls, showing site of insect ovum "between nucollar epidermis
and parenchyma
Insect ovum^ and portion o£ nuoellar parenchyma from a similar ovule x 370
Ovum as expressed from the body of a female insect x3 7 0
Vertical section through a gall-flower from a receptacle ready for the aocess of insects . x 119
e.s, stylar canal ; p, solid base of style ; o, wall of ovary ; f.v, bianohes of axial
fibro-vascular bundle ; s, secundine ; e.n, nucellar epidermis ; i.n, nuceUar parenchyma
; 6, site of deposit of ovum.
Inner stratum of cells of membrane surronnding the body of an embryo insect within
the ovary of a gall-flower * 370
Section of gall-receptacle ready for insects. Natural size.
Ditto ditto ditto,
a.a, area occupied by male flowers ; b, area occupied by ostiolar bracts; c, c, area
of gall-flowei-s.
Section of gall-reaeptacle which had matured without access of insects. Natural size.
Portion of a mature galled receptacle after escape of the fig-insects, showing tunnel
through ostiolar plug.
Section o! ovarian wall from an almost mature gall-flower containing an insect . . . x 370
Portion of a mature ungaUed gall-receptacle showing thioliness of stratum of gallflowers.
Natural size.
Portion of a mature galled receptacle, showing tiers of ovaries and uneven receptaoular
surface.
P L A T E V.
Vertical section through the apes oC the ovary of a true female flower fi'om a female
receptacle ready for the aocess of fig-inseots, shomng the different strata of the
ovarian wall, the secundine, the nncellar epidermis, and its apical thickening in
the mieropyle, the nucellar parenchyma with its apical thickening and embryogenic
cell, and the upper part of the embryo-sac ; stained with logwood . . . . x 370
Portion of vertical section of the apes of the ovary of another flower at the same
stage, showing a portion of the apical cap of nuoellar parenchyma, the embryogenio
cell, and apes of the embryo-sac x 690
PLiTES.
Fig. 4.
Fig. 5.
Fig. 6.
Fig- 7.
Fig, 10.
Fig- 11.
Fig. 12,
Fig. 13.
Fig. 14.
Pig- 15.
Fig, 16.
Fig, 17,
Fig. 18.
Fig, 19.
Fig, 20.
Fig, 21.
Fig. 22,
Portion of the nest serial section of the same ovary as that of figure 2, showing
apical cap of nuoellar parenchyma, embryogonic cell, and embryo-sac, with its
nucleus x 370
Portion of another ovary x 690
Ditto ditto X 370
Ditto ditto showing attachment of embryogenio cell to the under surface
of the apical cap of nucellar parenchyma.
Portion of the base of an ovary, showing basal thickenioga of nuoellar epidermis and
parenchyma from a female flower in a receptacle ready for insects x 370
Ovule from a female flower of a receptacle ready for insects, showing raphe, secundine,
and nucellar epidermis and parenchyma, with basal and apical thickenings ; stained
with picrocarmine x4 2
Ovule from a female flower in a receptacle to which fig-inseots had recently gained access,
showing development of the ombryogenic oell and the presence of seoundary nuclei
in the embryo-sac xl I 9
Embryo-sac and embryogenio cell of the same ovule x 370
Embryogénie oell and portion ef apical cap of nuoellar parenchyma, showing initial
stage of evolution of the embryogenio cell subsequent to the aocess of insects to the
receptacle x 690
Commencing evolution of the pro-embryo within the enlarged embryogenio cell , , . x 690
Upper part of the embiyo-sao of a flower fi'om a receptacle shortly after access of insects,
showing the mru'k on the apes of the sac corresponding with the under surface of
the enlarging embryogenio cell ; also the persistent primary nucleus x 370
Portion of vertical section of the apes of the ovary of a female flower from a receptaclo
sliortly after the access of insects, showing the pro-embryo and the embryogenio cell,
with its processes, and its attachment to the under surface of the apical cap of
nucellar parenchyma ; stained with logwood 373
Ditto ditto ditto ditto x 690
Portion of vertical section of the base of au ovary of a female flower from a receptacle
shortly after access of insects, showing peculiar outgrowth of nncellar parenohyma . x 370
Vertical section through ovarian wall of a ti'ue female flower fi-om a receptacle ready for
insects ; staiued with picrooarmine 37Q
Vertical section through the wall of a ripe achene ; stained with gentian violet . . . x 370
External epidermis of ovary of a mat-ure female flower gjQ
Hypodennal cells of ovary of mature female flower ; stained with gentian violet . . . x 160
Portion of vertical section of the base of an ovule of a female flower from a receptacle
shortly after aocess of insects ; stained with picrocarmine 37y
Vertical section through the ovarian wall of a gdl-flower from a receptacle ready for
i'lsects
\V. H, D'C.-Eeg- Ko, 11921J-350-27-4-;