860 
MR. W. GARDINER ON THE CONTINUITY OF THE 
bottoms and sides of the much swollen and resistent pits. The swollen 
cell-wall abuts directly on to the protoplasm. By long treatment with 
dilute glycerine all the colour becomes dissolved from the pits, and the 
protoplasmic masses are then left fairly isolated one from another, or by 
prolonged treatment with sulphuric acid the resistent pits become swollen, 
and then stain like the rest of the wall. ( X 1020.) 
Fig. 11. Cells of the pulvinus of Amicia zygomeris situated immediately around the 
vascular bundle, where the cell-walls are thick and the pits deep and 
well developed, after treatment with sulphuric acid and staining with 
methyl violet and glycerine. The protoplasmic processes tend to adhere 
to the pit-membrane, and between any two contiguous processes is a 
lighter stained area. (X 1020.) 
Fig. 12. A cell from the rachis of the leaf of Cycas revoluta, treated with iodine and 
Chlor. Zinc Iod. The pits opposite the intercellular spaces stain deep 
blue, whereas those separating the contents of adjacent cells are but feebly 
coloured, (x 235.) 
PLATE 69. 
Fig. 13. 
Fig. 14. 
Fig. 15. 
Fig. 16. 
A cell from the ripe endosperm of Phoenix dactylifera after treatment with 
sulphuric acid and staining with methyl violet and glycerine. Some 
portions of the wall remain but little acted upon. The protoplasmic 
processes of the main shrunken mass have separated with difficulty from 
the pit-closing membrance, and the protoplasmic threads which traverse 
that structure, and normally abutted on to the ends of the protoplasmic 
processes of the pits, are well stained and brought into view. Compare 
figs. 6 and 11. (x 550.) 
Young endosperm cell of the seed of Archontophoenix Cunninghamii (Seu- 
forthia elegans) after treatment with sulphuric acid and staining with 
methyl violet and glycerine. The pit processes of adjacent cells are 
united by fine protoplasmic threads, after the manner of a sieve-tuhe. 
This compares with figs. 5 and 7. (X 550.) 
Young endosperm cell of Rliopalostylis sapidci (Arecct sapida ) after treat¬ 
ment with sulphuric acid, methyl violet, and glycerine. The processes 
from the shrunken protoplasm which enter the pits adhere to the pit¬ 
closing membrane, and the opposite processes of adjacent cells are united 
to one another and held in position by delicate protoplasmic threads 
perforating the pit-closing membrane, (x 550.) 
Cells of the ripe endosperm of Bentinckia Condci-panna after treatment with 
Chlor. Zinc Iod. and staining with picric-H ofmann ’s-blue. The proto- 
