400 LILY HUIE. 
such appearance in the apical cells. The secretion must, of 
course, leave the apical gland-cells somehow, and the albu- 
men pass somehow into the tentacle, but how it is impossible 
as yet to say quite definitely. Silver nitrate enters the tenta- 
cles most readily through the lateral gland-cells, and clefts 
appear between the apices of the apical gland-cells a few 
minutes after stimulation, and the albumen seems to pass in 
through these clefts, as will be shown later on. 
As Charles Darwin pointed out,! the extreme marginal ten- 
tacles of some leaves of D. rotundifolia differ from the 
other tentacles in exhibiting a unilateral development. Their 
heads are very much elongated, and bear the glandular surface 
on the ventral side only. The plan of structure is, however, 
the same as in ordinary tentacles, all the elements being 
present, and the unilateral development appears to be merely 
the result of pressure during early growth in the bud. 
Results of Histological Examination of Material 
fixed in Watery Picro-corrosive Sublimate, and 
stained with Eosin and Toluidin Blue. 
Before describing these results, it may be well to explain the 
names applied to the nuclear organs. 
Chromosomes are the organs which show the well-known 
affinity for alkaline dyes, and which are situated at the peri- 
phery of the nucleus. 
Nuclear Plasm is the material which in the resting state 
forms the main bulk of the nucleus, and is neutrophile in 
character; it corresponds to what is frequently called the 
nuclear sap. 
Nuclear Sap is the more watery fluid inside the nucleus, in 
which is suspended the nuclear plasm, the latter being precipi- 
table by HgCl, and other reagents. 
Nucleolar Chromosomes or Nucleoli are the spherical 
organs which show a special affinity for acid dyes, and have a 
more or less central position. 
Endonucleoli are spaces inside the nucleolus. 
1 Darwin, C., ‘Insectivorous Plants,’ p. 7. 
