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 Reduction in Lilium canadense. Bot. Gaz., vol. 37, 
p. 464. 
ALLEN. 
:05. Nuclear Division in the Pollen Mother-Cells of Zilium canadense. 
Annals of Bot., vol. 19, p. 189. 
ATKINSON. 
'99. Studies on Reduction in Plants. Bot. Gaz., vol. 29, p. t. 
BAUMGARTNER. 
:04. Some New Evidence for the Individuality of the Chromosomes. 
Biol. Bull., vol. 8, p. 1. 
BELAJEFF. 
; 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 mürs dans la micro- 
sporogénése d 'AZ/zum fistulosum et de Lilium lancifolium (spect- 
osum). La Cellule, vol. 21, p. 173- 
BERGHS. "m 
:04b. Depuis la sporogonie jusqu'au spireme définitif dans la micro- 
sporogénése de VAllium fistulosum. La Cellule, vol. 21, p. 383. 
