Plate V. 

 All figures except 128 and 129, refer to Zannichellia. 



Fig. 104. Longitudinal section of a nearly mature female inflorescence; 

 X 40. 



Fig. 105. Longitudinal section of a nearly mature ovule; X 200. 



Fig. 106. Two sections of an embryo-sac after the formation ot the egg 

 apparatus and antipodals; X 400- 



Fig. 107. Lower part of a mature embryo-sac, with four antipodal cells; 

 k, the lower polar (?) nucleus; X 350. 



Fig. 108. Egg apparatus at the time of fertilization; pt, pollen-tube; o, 

 egg; s, synergidse; X 400. 



Fig. 109. Antipodal region of mature embryo-sac. 



Fig. 1 10. Two sections of an abnormal embryo-sac, with numerous free 

 nuclei; X 400. 



Fig. 111-116. Successive stages in the development of the young embryo; 

 longitudinal sections X 400. The primary segments are numbered. 



Figs. 117, 118. Older embryos; X 200; st, stem-apex; cc^, cotyledon. 



Fig. 119. Two sections of an abnormal embryo, in which, apparently, one 

 synergid, s, was persistent, and adherent to the embryo; X 400. 



Fig. 120. Section of an advanced embryo; X 70. 



Fig. 121. Stem-apex of the same embryo; X 200. /^, the second leaf. 



Fig. 122. The root of an embryo of the same age. re. root.cap; sus^ 

 secondary suspensor. 



Fig. 123. Root of an almost full-grown embryo. 



Fig. 124. Longitudinal sections of nearly mature embryos; X 40; a shows 

 the stem-apex and root; b, the hooked cotyledon. 



Fig. 125. Cross-section of an internode from the stem of a mature plant; 

 X 70. 



Fig. 126. Longitudinal section of the apex of a root from the mature 

 plant, showing the four primary tissues; plerome, //; periblem, pb; dermato- 

 gen, d; and calyptrogen, cal; X 200. 



Fig. 127. Epidermal cells from near the root-apex, c, surface view; b, a 

 vertical section; X 400. The cells with dense contents are apparently secre- 

 tory cells. 



Fig. 128. Embryo-sac of Sparganiuni eurycarpum Englm, with about 

 ten free nuclui, and four antipodal cells. 



Fig. 129. Two sections of an embryo-sac of Sparganium eurycarpum 

 Englm, showing extraordinary development of the antipodal cells, ant. 



