SOMATIC CHROMOSOMES IN TRADESCANTIA 
353 
LITERATURE CITED 
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Amphiuma. Arch. Zellforsch, i: 450-514. pis. 11-15. figs. 2. 
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kotylen. Jahrb. Wiss. Bot. 42: 83-120. pis. 3-5. 
Miiller, H. A. C. 1911. Kernstudien an Pfianzen. I und IL Arch. Zellforsch. 8: 1-51. 
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Nothnagel, M. 1916. Reduction divisions in the pollen mother cells of Allium tricoccum. 
Bot. Gaz. 61: 453-476. pis. 28-30. I fig. 
Sharp, L. W. 1913. Somatic chromosomes in Vicia. La Cellule 29: 297-331. 2 pis. 
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Strasburger, E. 1900. Ueber Reduktionsteilung, Spindelbildung, Centrosomen und 
Cilienbilder im Pflanzenreich. Hist. Beitr. 6. 224 pp. 4 pis. Jena. 
Wenrich, D. H. 19 16. The spermatogenesis of Phrynotettix magnus with special reference 
to synapsis and the individuality of the chromosomes. Bull. Mus. Comp. Zool. 
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EXPLANATION OF PLATES 
Plate XXH 
All figures except no. 8 were drawn at the level of the table with the aid of an Abbe 
camera lucida under a Zeiss apochromatic objective, 2 mm. N.A. 1.40, with compensating 
ocular 18. They have been reduced one-half in reproduction and now show a magnification 
of 1900 diameters. Fig. 8, X 950. 
Fig. I. Metaphase: chromosomes attached to spindle by middle points. 
Fig. 2. Anaphase: daughter chromosomes separating. 
