Title: Contributions from the Botanical Laboratory, vol. 7
Identifier: contributionsfro07univ (find matches)
Year: 1892 (1890s)
Authors: University of Pennsylvania. Botanical Laboratory
Subjects: Botany; Botany
Publisher: Philadelphia : University of Pennsylvania Press
Contributing Library: Penn State University
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
Figs. 1-17.'—Fig. i, young pollen mother cell; fig. 2, nucleus showing leptotene threads; fig. 3, synizesis; fig. 4, pachynema, segments showing doubleness; fig. 5, strepsinema, chromosomes twisted about one another; fig. 6, early diakmesis; fig. 7, late diakinesis; fig. 8, multipolar spindle with double chromosomes in meshes; fig. 9, first metaphase; fig. 10, end of metaphase, homologous chromosomes separatmg; fig. n, anaphase showing attenuated form of chromosomes as they pass to poles; fig. 12 late anaphase; fig. 13, twenty chromosomes at pole of spindle; fig. 14, early telophase (chromosomes have lost rounded appearance); fig. 15, nuclear membrane formed at telophase, chromatin and nucleoli reorganizing; fig. 16, late telophase showmg three nucleoli; fig. 17, nucleus at end of first division. » All figures are of Jersey White Bush squash, Xisoo.
Text Appearing After Image:
Figs. 18-23.^—Fig. 18, spindle becoming bipolar, paired chromosomes arranging themselves at equator; fig. iq, polar view of second metaphase; fig. 20, second meta- phase, spindles parallel; fig. 21, late second telophase; fig. 22, furrows dividing cell into quartets; fig. 23, microspores within sporocyte wall. »All figures are of Jersey White Bush squash, except fig. rg, which is English vegetable mar- row; X7SO.

Note About Images