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. Intorno ad alcune strutture nucleari. Atti. dell. Inst. hot. Univ. 



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. 

 CRATO. 



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



Gesell. 10, 295. 

 CROSS AND BEVAN. 



'96. Cellulose, an outline 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. Phih Trans. Roy. Soc. 190, 623, 1898. 

 FISCHER. 



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



