No. 464.] STUDIES OF PLANT CELL— VII. 589 



have failed to stand the test of critical investigation, in the 

 light of the present theory. Thus certain investigators have 

 reported xenia in the color of the seed coats of certain peas. 

 But Giltay ('93) in a series of experiments found no instance 

 where color was transmitted to these tissues. The pigments in 

 these plants lie in the cotyledons of the embryo which of course 

 are readily visible through the thin coats of the seed. While 

 the present theory of xenia is very recent and has been critic- 

 ally applied in few forms, it seems thoroughly satisfactory in 

 every particular with no clearly established evidence against it. 



LITERATURE CITED IN SECTION V, " THE PLANT 



CELL." 



Allen. 



:04. Chromosome 'S..tA\XQAoT\va. Liliu7n canadense. Bot. Gaz.,No\. ■^'], 

 p. 464. 

 Allen. 



: 05. Nuclear Division in the Pollen Mother-Cells of Lilium canadense. 

 Annals of Bot., vol. 19, p. 189. 

 Atkinson. 



'99. Studies on Reduction in Plants. Bot. Gaz., vol. 29, p. i. 

 Baumgartner. 

 : 04. Some New Evidence for the Individuality of the Chromosomes. 

 Biol. Bull., vol. 8, p. I. 

 Belajeff. 



'98. Ueber die Reductionstheilung des Pflanzenkernes. Ber. d. deut. 

 bot. Gesellsch., vol. 16, p. 27. 

 Beard. 



'95. On the Phenomena of Reproduction in Animals and Plants. Anti- 

 thetic Alternation of Generations. Annals of Bot., vol. 9, p. 441. 

 Berghs. 



: 04a. Depuis le spirem jusqu'aux chromosomes murs dans la micro- 

 sporogdnfese d ^Allium fistulosum et de Liliuin lancifolium (speci- 

 osum). La Cellule, vol. 21, p. 173. 

 Berghs. 



: 04b. Depuis la sporogonie jusqu'au spireme ddfinitif dans la micro- 

 sporogfofese de VAllium fstulosum. La Cellule, vol. 21, p. 383. 



