392 



THE AMERICAN NA TURALIST. [Vol. XXXVI IL 



may expect to find these envelopes in a fairly primitive con- 

 dition and may be able to establish the steps in the origin and 

 differentiation of this very important accessory structure to the 

 plant cell. 



(To be continued.) 



LITERATURE CITED FOR SECTION I "THE PLANT CELL." 



di Pavia, II, 5, 1898. 

 Chamberlain. 



'99. Oogenesis in Pinus laricio. Bot. Gaz. 27, 268, 1899. 

 '03. Mitosis in Pellia. Bot. Gaz. 36, 27, 1903. 



'92. Die Physode, ein Organ des Zelllenleibes. Ber. d. deut. bot. 



Gesell. 10, 295. 

 Cross and Bevan. 



'96. Cellulose, an oudine of the chemistry of the structviral elements of 



plants. 1895. 



Davis. 



'98. Kerntheilung in der Tetrasporenmutterzelle bei Corallina officinalis 



L. var. mediterranea. Ber. d. deut. bot. Gesell. 16, 266, 1898. 

 '99. The spore mother cell of Anthoceros. Bot. Gaz. 28, 89, 1899. 

 :01. Nuclear studies on Pellia. Ann. of Bot. 15, 147, I9°i- 

 :03. Oogenesis in Saprolegnia. Bot. Gaz. 35, 233 and 320, 1903. 

 DeVries. 



'85. Plasmolytische Studien iiberdie Wand der Vacuolen Jahrb. f. wiss. 

 Bot. 16, 465, 1885. 



'91. Beitrage zur Entstehungsgeschichte der Starke. Jahrb. f. wiss. 



and cytolog}^ Phil. Tran.s. Roy. Soc. 190, 623, 1898. 



Fischer. 



'99. Fixirung, Farbung und Bau des Protoplasmas. Leipzig, 1899. 



