Nichols, A morphological study of Jumper ns communis var. depressa. 237 
Noren, C. 0., Zur Entwicklungsgeschichte des Juniperus communis. (Upsala 
Univ. Arsskr. pp. 64. 4 pls. 1907.) 
— Zur Kenntniss der Entwicklung von Saxegothaea conspicua Lindl. (Svensk. 
Bot. Tidskr. 2: 101-122. pls. 7. 8. 1908.) 
Osterhout, W. J. V., Über Entstehung der karyokinetischen Spindel bei Equi- 
setum. (Cytol. Stud. pp. 5—14. pls. 1. 2. 1897.) 
Overton. J. B., Über Reduktionsteilung in den Pollenmutterzellen einiger Di¬ 
kotylen. (Jahrb. wiss. Bot. 42: 121—153. pls. 6. 7. 1905.) 
Robertson, A., Spore formation in Torreya californica. (New Phytol. 3: 
133—148. pls. 3. 4. 1904.) 
— The Taxoideae, a phylogenetic study. (New Phytol. 6 : 92—102. pl. 1. 1907). 
Sludsky, N., Über die Entwicklungsgeschichte des Juniperus communis. Vor¬ 
läufige Mitteilung. (Ber. Deutsch. Bot. Gesell. 23: 212—216. pl. 6. 1905.) 
Sokolowa, C., Naissance de Fendosperme dans le sac embryonnaire de quelques 
gymnospermes. (Bull. Soc. Nat. Moscow. N. S. 4:446—497. pls. 11—13. 
9 f. in text. 1890 (1891).) 
Stop es, M. C., and Fujii, K., The nutritive relations of the surrounding 
tissues to the archegonia in gymnosperms. (Beih. Bot. Oentralbl. Abt. I. 
20: 1—24. pl. 1. 1906.) 
Strasburger, E., Die Angiospermen und die Gymnospermen. (Jena 1879.) 
— Über den Bau und das Wachsthum der Zellhäute. (Jena 1882.) 
— Über das Verhalten des Pollens und die Befruchtungs-Vorgänge bei den 
Gymnospermen. (Hist. Beitr. 4: 1—46. pls. 1—3. Jena 1892.) 
— Karyokinetische Probleme. (Jahrb. wiss. Bot. 28: 151—204. pls. 2. 3. 1895.) 
— Über Reduktionstheilung, Spindelbildung, Centrosomen, und Cilienbildner im 
Pflanzenreich. (Hist. Beitr. 6: 1—224. pls. 1—4. Jena 1900.) 
Thomson, R. B., The megaspore membrane of the gymnosperms. (Univ. Tor¬ 
onto Studies, Biol. Ser. No. 4. pp. 64. 6 pls. 1905.) 
Wäger, H., The nucleolus and nuclear division in the root-apex of Phaseolus. 
(Ann. Bot. 18: 29—55. pl. 5. 1904.) 
Webber, H., Spermatogenesis and fertilization of Zamia. (U. S. Dept. Agr. 
Bur. Pit. Ind. Bull. No. 2. pp. 100. 7 pls. 1901.) 
Wilson, E. B., The cell in development and inheritance. (New York 1900.) 
Wovcicki, Z., Fertilization in the Conifers. pp. 58. 2 pls. (Warsaw (in 
Russian) 1899.) 
Explanation of plates VIII—XYII. 
All figures drawn with the aid of a camera lucida. 
Plate VIII. 
Sections of misrosporophylls showing successive stages in development of 
microsporangia. Sections cut radially through staminate cones. 
Fig. 5. Archesporial enitials. X 285. 
Fig. 6. First periclinal division of archesporial cells. X 285. 
Fig. 7. More advanced stage in development of archesporium. X 285. 
Fig. 8. Differentiation of archesporium into primary sporogenous cells, 
tapetum, and inner wall layer. X 285. 
Fig. 9. Sporangium just before synapsis. X 285. 
Fig. 10. Sporangium during synapsis. X 285, 
