LIFE HISTORY OF PINUS I53 



1901 Spermatogenesis and Fecundation of Zamia. U. S. Dept. Agric. Bu- 

 reau of Plant Indus., Bull. No. 2, pi. 1-6, 7-100. 

 Wiegand, K. M. 



1899 Development of the Microsporangium and iSIicrospores in Convallaria 

 and Potamogeton. Bot. Gaz., 28, pi. 24-25, 32S-359. 



1900 The Development of the Embrjosac in some Monocotyledonous Plants, 

 Bot. Gaz., 30, pi. 6-7, 25-47. 



Wilcox, E. V. 



1895 Spermatogenesis of Caloptenus femur-rubrum and Cicada tibicen. 

 Bull. Mus. Comp. Zool. Harvard Univ. 27, pi. 1-5, 3-34. 

 Williams, J. Lloyd. 



1904 Studies in the Dictyotaceae. I. The Cytology of the Tetrasporangium 

 and the Germinating Tetraspore. Ann. Bot. 18, pi. 9-10, 141-160. 

 Wilson, E. B. 



1895 Archoplasm, Centrosome, and Chromatin in the Sea-Urchin's Egg, 

 Journ. of Morph., 11, 12 prototyes and 10 text-figures, 443-479. 



1899 The Structure of Protoplasm. Science, 10, No. 237, 9 text-figures, 33- 

 44. 



1900 The Cell in Development and Inheritance. New York, 1-481. 

 Worsdell, W. C. 



1900 The Structure of the Female Flower in Coniferae. Ann. Bot., 14, 7 

 text-figures, 39-83. 



Wuicizki, Z. 



1899 Ueber die Befruchtung bei den Coniferen. Warschau (Russisch). An 

 abstract in Bot. Zeit., 58, part 2, 39, 1900. Also see Journ. Roy. Micr. 

 Soc, August, 1900. 

 Zacbarias, E. 



1885 Ueber den Nucleolen. Bot. Zeit., 43, 257-265, 273-283, 289-295. 



1901 Ueber Sexualzellen und Befruchtung-Sonderabzug aus dem Verhand. 

 d. Naturwiss-vereins im Hamburg, 1-4. 



1901 Beitrage zur Kentniss der Sexualzellen. Ber. d. deutsch. Bot. Gesell., 

 19. 377-396. 

 Zimmerman, A. 

 *i893 Ueber das Verhalten der Nucleolen wahrend der Kerntheilung. Beitr. 

 zur Morph. und Phys. der Pflanzenzelle, 2. 



1896 Die Morphologic und Physiologic des pflanzlichen Zellkernes. Eine 

 kritische Literaturstudie. Jena. 



Zola, R. 



1895 Sulla independenza della cromatina paterna e materna nelnucleo dclle 

 cellule embrionali. Anat. Anz., 11, 3 text-figures, 289-293. 



Proc. Wash. Acad. Sci., September, 1904. 



