862 
MR. W. GARDINER ON THE CONTINUITY OF THE 
Fig. 27. 
Fig. 28. 
Fig. 29. 
Fig. 30. 
Fig. 31. 
Fig. 32. 
Fig. 33. 
Fig. 34. 
Fig. 35. 
Fig. 36. 
Fig. 37. 
Fig. 38. 
Portion of cell-wall of almost ripe endosperm of Botnarea oligantha “treated 
with Chlor. Zinc Iod. and picric-HoFMANN’s-blue. In the case of one of 
the pit-closing membranes the badly developed threads are not present 
over the whole of its surface. (X 550.) 
En face view of same. In the upper of the two pits the threads run 
as in the last described example. In the lower they are distributed 
equally over the surface. The figure is badly drawn, for in the upper 
pit the sections of the threads should have been more plainly apparent, 
and in the lower the unstained portions should have been represented 
stained, and vice versa, (x 1020.) 
Portion of cell-walls of ripe endosperm of Ruscus aculeatus treated with Chlor. 
Zinc Iod. and picric-IIoFMANN’s-blue. Pit-membranes thin. Threads 
badly developed and seen with difficulty, (x 550.) 
Portion of cells of ripe endosperm of Colchicum speciosum treated as before. 
Threads much better defined. (X 550.) 
Portion of cell-walls of ripe endosperm of Asperula odorata treated with 
iodine and Chlor. Zinc Iod. Threads traverse pit-membranes and walls. 
(X 550.) 
Portion of cell-walls of ripe endosperm of Nemophila parviflora treated 
with Chlor. Zinc Iod. and picric-HoFFMAiSN’s-blue. Cells small. Pit- 
membranes thin. Threads difficult to see. (X 550.) 
Portion of cell-walls of ripe endosperm of Tamus communis treated with 
iodine and Chlor. Zinc Iod. Part of the wall much swollen and coloured 
blue, in consequence of the usual cellular reaction. In this swollen area 
the threads can no longer be detected. In the lower half of the figure 
the apparently unswollen walls are commencing to swell, and the proto¬ 
plasmic threads are breaking up into small points, instead of presenting 
the appearance of lines, as in the walls of the upper half of the section, 
which are still fairly intact. (X 550.) 
Cell of pulvinus of Robinia pseuclacacia after treatment with a 10 per cent, 
solution of common salt. Appearance presented some two hours after 
plasmolysis. Certain of the threads can be seen going to pits. (X 550.) 
Cell of same tissue examined about ten minutes after mounting in 10 per 
cent, salt solution, (x 550.) 
Similar cell treated in the same way. Examined half an hour after treat¬ 
ment. (X 550.) 
Cells of pulvinus of Apios tuberosa treated with 5 per cent, salt solution. 
Examined three hours after plasmolysis. (X 440.) 
Cells of pulvinus of Apios tuberosa after treatment with 10 per cent, salt 
solution, saturated watery picric acid, and Hofmann’s blue. Some of 
the threads are fairly preserved. Two thick threads appear to perforate 
