392 THE AMERICAN NATURALIST. [Vol. XXXVIII. 



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." 



Cavara. 



'98. Intomo ad alcune strutture nucleari. Atti. dell. Inst. bot. Univ. 

 di Pavia, II, 5, 1898. 

 Chamberlain. 



'99. Oogenesis mPinus laricio. Bot. Gaz. 27, 268, 1899. 

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

 Crato. 



'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 structural 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, 1901. 

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

 DeVries. 



'85. Plasmolytische Studien iiber die Wand der Vacuolen Jahrb. f . wiss. 

 Bot. 16, 465, 1885. 

 Eberdt. 



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

 Bot. 22, 293, 1891. 

 Farmer and Reeves. 



'94. On the occurrence of centrospheres in Pellia epiphylla., Nees. 

 Ann. of Bot. 8, 219, 1894. 

 Farmer and Williams. 



'98. Contributions to our knowledge of the Fucaceae ; their life history 

 and cytology. Phil. Trans. Roy. Soc. 190, 623, 1898. 

 Fischer. 



'99. Fixirung, Farbung und Bau des Protoplasmas. Leipzig, 1 899. 



