618 MB. S. LE M. MOORE'S STUDIES 



Fig. 4. The same, after exhibition of solution of iodine in alcohol : the cell has 

 been swollen up in water ; plasinolytic threads remain as a fray upon 

 the edge of the protoplasm. X 600. 



5. The same. View of wall, from above, showing the debouching points 



of the intramural threads. X 600. 



6. The same. Epidermis and underlying cells treated with water. The 



section was taken in a plane parallel to the axis of growth. X 140. 



7. The same. A subepidermal cell after lying twenty-four hours in chlor- 



iodide of zinc. X 600. 



8. Strychnos potatorum. Continuity of the protoplasm of two endosperm- 



cells. Chloriodide-of-zinc preparation. X 600. 



9. The same. Cells swollen up in water. X 600. 



10. Strychnos spinosa. Small portion of section of endosperm treated with 



solution of iodine in alcohol. X 600. 



11. Section through the short cells of the endosperm of Diospyros embryo- 



pteris, showing continuity of their protoplasm through the walls ; after 

 lying in chloriodide of zinc for twenty hours. X 600. 



12. The same, after twenty-four hours' action of chloriodide of zinc ; the 



threads stained with picric blue. X 600. 



13. A long cell of the same, treated similarly to the last : plasmolytic threads 



visible at one point. X 600. 



14. Eift in the wall of the same. X 600. 



15. A small portion of the wall, from above. X 600. 



16. Strychnos Nux-vomica. The lumen of the two endosperm-cells showing 



plasmolytic threads passing into intramural ones, thus demonstrating 

 continuity. After action of solution of iodine and alcohol and sub- 

 sequent treatment with a small quantity of water. X 600. 



Plate XX. 



Fig. 17. Plasmolytic threads from endosperm of Strychnos Ignatia ; and fig. 18, 

 from that of S. potatorum. Same treatment as the last. X 600. 



19. Pectinate appearance produced by the pits in the wall of the endosperm- 



cells of S. potatorum. X 600. 



20. A stellate cell from the tetraspore-bearing process of Chondrus tnamil' 



losus, its lumen reduced to a mere point of junction. X 600. 



21. Larger cells from the same, showing direct continuity. X 600. 



22. Transverse section of a portion of the frond of Polyides rotundatus, 



showing direct continuity. Not drawn to scale. 



23. The same. Connection between a granuliferous cell and one of the long 



cells of which the centre of the frond is largely made up. X 600. 



24. The same. Direct continuity between two of the small cells at the 



surface of the frond, x 900. 



25. Ceramium rubrum. a. Two of the axial cells, showing continuity ot 



their protoplasm through small perforations in the membrane of a 

 ring : one of the cells has two crystalloids, the other a single one. 

 6. A ring, from above ; it shows a highly refractive edge and perfo- 

 rated membrane. Glycerine preparation. X 600. 



26. The same. a. A ring showing division of the threads in anticipation 



