. Contributions from the Botanical Laboratory, vol. 9. Botany; Botany. BOTANICAL GAZETTE, XCII PLATE I 64 BOTANICAL GAZETTE [SEPTEMBER 20. Taylor, W. R., The smear method for plant cytology. Box. Gaz. 78:236- 238. 1924. 21. , Cytological studies on Gasteria. I. Chromosome shape and indi- viduality. Amer. Jour. Bot. ii:5ih3i. 1924. 22. , The chromosome morphology of Velthemia, Allium, and Cyrtanthus. Amer. Jour. Bot. 12:104-116. 1925. 23. , Cytological studies on Gasteria. II. A comparison of chromosomes of Gasteria, Aloe, and Hawarthia. Amer. Jour. Bot. 12:219-223. 1925. 24. , Chromosome const
. Contributions from the Botanical Laboratory, vol. 9. Botany; Botany. BOTANICAL GAZETTE, XCII PLATE I 64 BOTANICAL GAZETTE [SEPTEMBER 20. Taylor, W. R., The smear method for plant cytology. Box. Gaz. 78:236- 238. 1924. 21. , Cytological studies on Gasteria. I. Chromosome shape and indi- viduality. Amer. Jour. Bot. ii:5ih3i. 1924. 22. , The chromosome morphology of Velthemia, Allium, and Cyrtanthus. Amer. Jour. Bot. 12:104-116. 1925. 23. , Cytological studies on Gasteria. II. A comparison of chromosomes of Gasteria, Aloe, and Hawarthia. Amer. Jour. Bot. 12:219-223. 1925. 24. , Chromosome constrictions as distinguishing characteristics in plants. Amer. Jour. Bot. 12:238-244. 1925- 25. , Chromosome morphology in Frilillaria, Alstroemeria, Silphium, and other genera. Amer. Jour. Bot. 13:179-193- 1926. 5. ^ Chromosome studies on Gasteria. III. Chromosome structure dur- ing microsporogenesis and the postmeiotic mitosis. Amer. Jour. Bot. (In Press). 1931. 27. TuAN, H. C, A new method for safranin differentiation. Stain Tech. 5: 103- 107. 1930. 28. , Picric acid as a destaining agent for iron alum haematoxylin. Stain Tech. 5:135-138. 1930. EXPLANATION OF PLATES I, II All drawings were made with the aid of Zeiss mm. apochromatic objec- tive and X 20 compensation ocular, giving an approximate magnification of 4500. PLATE I Fig. 15.—Open spireme nucleus. Fig. 16.—Nucleus at diakinesis stage. Pig jy —Segment of diakinetic chromosomes showing first sign of regression. Fig. 18.—Giant headed chromosomes showing structural detail. Fig. 19.—Mid-telophase chromosomes showing loosely connected spirals. Fig. 20.—First telophase chromosomes (a, b, c) showing origin of con- strictions. Fig. 21.—Early telophase nucleus showing loosening of spirals and forma- tion of nuclear membrane at side near polar region. Fig. 22.—Third division chromosomes (a, b, c, d) showing process of re- gression. Fig. 23.—Late telophase spiral showing anastomoses and vacuolation. Fig. 24.
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