LIST OF PLATES AND PHOTOMICROGRAPHS. 



Transverse Sections of Various Stems, . 



PLATE 



I. and II. Pliases in Mitosis, ..... 



III. Stages in the Maturation of the Embr3'o-sac 



in Angiosperms, 



IV. Stages in Endosperm Formation in Angiosperms, 



FIO. 



6a. Young Cells of the Endosperm of Callha palusiri 



36a. The Cambial Region of Stem of Sambucus, . 



366. Transverse Seution of a Primary Bundle in a 

 Dicotyledonous Stem, .... 



51. Transverse Section of the Root of Piims, 



65a. Resin-canals in the Xylem of Pinus Stem, . 



96 and 97. The Completely-matured Embryo-sac of Hellehorua. 



104. Archegonia in the Prothallium of Pinus, 



