384 4... BOTANICAL GAZETTE [JUNE 
32. STEVENS, W..C.: Ueber Chromosomentheilung bei der Sporenbildung 
der Farne. Ber. d. deutsch. bot. Gesells. 16: 261-265. 189 
33. STRASBURGER, E. und MorttieEr, D. M.: Ueber den zweiten Theilungs- 
a schritt in Pollenmutterzellen. Ber. d. deutsch. bot. Gesells. 15 : 327- 
332. 1097. 
34. STRASBURGER, E.: Ueber Cytoplasmastructuren, Kern- und Zelltheilung. 
. f. wiss, Bot. 30: 375-405. 1897. 
35: Wacol, K. M.: The development of the microsporangium and micro- 
spores in Convallaria and Potamogeton. Bot. Gaz. 28 :328-359. 1899. 
EXPLANATION OF PLATES IV-IX. 
The figures are reduced to three eighths of their original size. All the 
figures not especially indicated are from Evythronium albidum. The combi- 
nation of objective and ocular is given for each case, the following being 
used: Zeiss compensating oculars, 4, 6, 12, 18; Zeiss 8.o™™ apochromatic 
objective; Leitz 7s oil immersion and 1 objective; Leitz ocular 8; Bausc 
and Lomb +; oil immersion and 3 objectives. The drawings were made with 
the aid of an Abbé camera lucida. 
Fic. 1. Section of young bulb showing region of cell division dotted. L. 
FiG, 2. Normal resting nucleus in growing tip of bulb. B. & L. dy Z. 12. 
Fic. 3. a, 6, ¢, etc. Nucleoli of various shapes from nuclei in growing 
Aas 4. Elongating nucleus in region of developing vascular bundle. B. 
& L. yy Z. 12. 
Fie, 5. Close mother ie with incipient spindle, from young bulb; 
fuchsin iodin- green. B.& b. a2) Fs. 
Fig. 6. Dome-shaped ae from bulb with granular areas at the tips of 
‘the domes; anilin-safranin gentian-violet. B. & L. yy Z. 4 
Fig. 7, Dome-shaped spindle with centrospheres, from bulb; chromatin 
granules distinct; early close mother skein; anilin-safranin gentian-violet. 
Be 1, fe 2. 12. 
Fig. 8. Early close mother skein ise dome-shaped spindle, from bulb; 
anilin-safranin gentian-violet. B. ee eee 
FiG. 9. Beginning of looped mother skein with bipolar spindle and cen- 
narroetg fin bulb; anilin-safranin gentian-violet. B. & L 
IG. 10. Spindle with centrospheres from nucellus; anilin-safranin gen- 
tian-violet. L, py Z. 12 
Fig. 11. Cell with serch: from bulb.- B. & L. yy Z. 4.. 
Fig. 12. Dividing cell, packed with starch, hots bulb. B. & L. +g Z. 12. 
Fig. 13. Cross section of style showing glandular cells lining the style 
canal. B. & L. # 
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