i9o8] NICHOLS— POLLEN OF SARRACENIA 37 



3. Hacker, V., Die Vorstadien der Eireifimg. Archiv. Mikr. Anat. 45:244- 



256, pis. 14-17. 1895. 



w 



4. McGiLL, Caroline, The behavior of the nucleoli during oogenesis, with 

 especial reference to synapsis. Zool. Jahrb. 23:208-223. ph. 13-16. 1906. 



5- MiYAKE, K., Ueber Reduktionsteilung in PoUenmutterzellen einiger Mono- 

 kotylen. Jahrb. Wiss. Bot. 42:83-116. ph. j-§. 1906. 



6. AIoxTGOiiERY, T. H,, Jr., Comparative cytological studies with especial 

 reference to the morpholog}^ of the nucleolus. Jour. Morph, 15:267-400. 

 ph. 2i~jo. 1899. 



7- Nkmec, B., Zur Phvsiologie der Kern- und Zellteilung. Bot. Centralbl. 

 77:246. 1S99. 



8. 0\^RTOX, J. B., Ueber Reduktionsteilung in PoUenmutterzellen einiger 

 Dikotylen. Jahrb. Wiss, Bot. 42:121-151. ph. 6, 7. 1906. 



9- Strasburger, E., Ueber Reduktionsteilung, Spindelbildung, Centrosomen, 



und Cilienbildner in Pflanzreich. Jena.- 1900. 



10. Shreve, F., The development and anatomy of Sarracenla. Box. Gazette 



42:107-123. pis. js, 1906. 

 II- Wager, H., The nucleolus and nuclear division in the root apex of Phaseo- 



lus. Annals of Botany 18:30-40. pi. 5. 1904, 

 12. Wilson, E. B., The cell in development and inheritance 34. New York. 



1900. 



EXPLANATION OF PLATE V 



The drawings were made with the camera lucida, ocular 6, oil immersion 

 objective iV, enlarged to twice the original size and reduced one-half. 

 Figs. i~io, S. purpurea; 11, 12, 27, and 34, 5. fava; 13-21, 23, 24, 26, 28, S. 



flavaXS. purpurea; 22, 25, 2^-32, 33, 3S-4O7 S- 'variolaris 



Fig. I. Resting pollen mother cell; a, J, c, nucleoli. 



Figs. 2-8. Transition to s}Tiapsis; 3a, 5, c, d, nucleoli; fig^ 5, pole \iew; 

 fig' 6j side view of approximately the same stage. 



Figs. 9-12. Synapsis; gradual emergence of the nucleolus. 



the level of the nucleolus. 



chromatin by the nucleolus; fig. 



Fig. 



20 



substance 



rmation of the chromatic networic; figs. 23b and 



29-32 



Figs. ;^^y 34. First maturation spindles. 



same 



Figs. 36, 37. Second maturation division. 



Fine .Q_.^ nr.r..r.u^;r.-n rif tK*^ re!! divi5;ions and formatioa of cell walls 



^ 



