3l6 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



71. Terni, T. Arch. Zellforsch. 12: 1-96. 1914. 



72. Thompson, D'A. W. 8010110011.34:417-428. 1911. 



73. Timberlake, H. G. Bot. Gaz. 30: 73-99; 154-170. 1900. 



74. Tischler, G. (a) Bor. Dcutsoh. Bot. Ges. 24: 83-96. 1906. (b) 



Jahrl). WIss. Bot. 42 : 545-578. 1906. (r) Arch. ZoUforsch. i : 33- 

 151. 1908. (ff) Arch. Zellforsoh. 5: 622-670. 1910. 



75. Treub, M. (a) Verh. K. Akad. Wotensoh. Amsterdam 19: 1-34. 



1S7S. (h) Ann. Jard. Bot. Buitenzorg 2: 32-53. 1885. 



76. Tschistiakoff, J. Bot. Zoit. 33: i- 17- 33-.81-, 97- 329- 345- 



1-^75- 



77. Tuttle, A. H. Jour. Exp. Zool. 9: 143-157. 1910. 



78. Wager, H. Ann. Bot. 18: 29-55. 1904. 



79. Went, F. C. Ber. Deutsch. Bot. Ges. 5: 247-258. 1887. 



80. Wiegand, K. M. Bot. Gaz. 28: 328-359. 1899. 



81. Wille, N. Forh. Vidonsk.-Selsk. Christiania, no. 5. 1886. 



82. Wimmel, T. Bot. Zcit. 8: 225-, 241-, 265-, 289-, 313. 1850. 



83. Wisselingh, C. van. Beih. Bot. Centralbl. 23: 137-156. 1908. 



XI. Explanation of plates 27-29 



The accompanying drawings were made with a Leitz one-sixteenth objective, Apert. 

 1.32, and ocular, number 3, with a tube length of 15. The cells are magnified about 

 1000 times in figures I to 19 inclusive, which are of living cells of Nicotiana. The fixed 

 cells of Nicotiana, figures 20 to 37 inclusive, were drawn about 1875 times their actual 

 size. 



1. Mother-cell in presynapsis. 



2. Diakinesis, w-all thickened. 



3. Equatorial plate stage of heterotypic kar>'okinesis. 



4. Anaphase and telophase of homoeotypic mitosis. 



5. Furrows which divide mother-cell just appearing. 



6. Similar stage, showing large intercellular spaces. 



7. Similar stage, with content plasmolysized to show ridges on wall. 



8. Furrows well developed, and having invaded the center of the cell. 



9. Isthmus becoming cjuite narrow. 



10. Another cell in similar stage. 



11. Isthmus having become ver>- narrow. 



12. Similar stage. 



13. Division complete, cell plasmolyzed to show form ot cross-wall. 



14. Division comjiiete, spores changing from an elliptical to a spherical form. 



15. Spores become perfect spheres, mother-wall becomes thinner. 



16. Four spores of unequal size, within the mot her- wall. 



17. Three spores of equal size within the mother- wall. 



18. Two large and one small spore within ihu mother-wall. 



19. Two spores within the mother-wall. 



20. Synapsis, showing wall thickened at ends of cell, and middle lamella. 



21. After heterotypic karyokinesis, ends of fibers attenuated. 



22. A little later, spindle inllatefi, wall thickening. 



