CHANGES IN CELL-ORGANS OF DROSERA ROTUNDIFOLIA. 407 
cytoplasm is dense. The entire cytoplasm stains red, except 
that at the apex of the cell there is a trace of blue. A few 
deep blue granules adhere to the exterior of the apical wall, a 
condition which I leave unexplained. Whether in figs. 6, 7, 
and 8 there is not more protoplasm than in cells stimulated 
1—5 minutes is difficult to say. Probably, as the result of 
stimulation, a temporary increase in the amount of cytoplasm 
occurs. 
The Nucleus is shrunken, leaving a clear white zone be- 
tween it and the surrounding cytoplasm. 
Nuclear Chromosomes appear as large granules, and are 
brought into close proximity to each other by the shrinkage of 
the nucleus. 
The Nuclear Plasm is the same colour as the surrounding 
cytoplasm, but appears deeper because of its greater density. 
The Nucleolus stains the same tint as the surrounding 
nuclear plasm, and therefore is difficult to see. In the speci- 
men figured it is invisible, hidden probably by the enlarged 
nuclear chromosomes. 
Effect of Stimulation for One to Four Hours onthe 
Apical Gland-cells. Fig. 7. 
The Cell Wall is very pale blue. The apical cells appear 
frequently to overlap each other, an appearance due to loss of 
turgor. 
The Cytoplasm is stained of a purple-red, becoming bluer in 
the apical fourth, where it is greatly vacuolated. There are 
very marked red granular aggregations in contact with the 
nucleus on its basal aspect. 
The Nucleus is somewhat swollen. Its position is normal. 
The Nuclear Chromosomes are larger than in unfed leaves. 
The Nuclear Plasm is shrunken to form a dense central 
mass, attached at fairly regular intervals to the nuclear peri- 
phery, so as to present a stellate outline. The vacuoles thus 
formed appear slightly blue. The nuclear plasm, because of 
its density, stains more deeply than the cytoplasm, but of the 
same tone of colour. 
