114 MOHL ON THE STRUCTURE OF THE VEGETABLE CELL. 
Fig.'7. Cambium cells of Sambucus Hbulus, with primordial utricles. 
Fig. 8. Liber-cell of Cocos botryophora, coloured by iodine. 
Fig. 9. Primary cellular membrane of the liber of Cocos botryophora, 
swelled in sulphuric acid. 
Fig. 10. Longitudinal section of the wood of Torreya taxifolia, half- 
swollen in sulphuric acid. 
Fig. 11. Dotted medullary cell of Hoya carnosa. 
Fig. 12. A piece of the last swollen in sulphuric acid ; in consequence 
of the tumefaction, the canal of the dot running through the centre has 
lost its sharp outline. 
Figs. 13 and 14. Ligneous cells of Juniperus virginiana, swollen in 
sulphuric acid. The primary membrane is torn by the swollen se- - 
condary membranes and is not represented. 
Figs. 15 and 16. Ligneous cells of Viburnum Lantana. 
Fig. 17. Cells from the cotyledon of Schotia speciosa, coloured by 
iodine. 
Puate II. 
Fig. 18. Transverse section of the parenchymatous cells of the stem 
of Polypodium incanum, coloured by iodine. 
Fig. 19. Transverse section of some cells of Furcellaria fastigiata. 
The primordial utricle lying in one of them is detached from the cell- 
wall. 
Fig. 20. Transverse section of a ligneous cell of Juniperus vir- 
giniana. 
Fig. 21. Transverse section of ligneous cells of Ficus Carica, co- 
loured by iodine. 
Fig. 22. Gelatinous cells lying beneath the epidermis of the stem of 
Spinacia oleracea. 
Fig. 23. Cells, as in fig. 22, treated with hydrochloric acid. 
Fig. 24. Ligneous cells from a cane (Calamus ?), coloured by 
iodine. 
Figs. 25 and 26. Liber-cells of Calamus, coloured by iodine. 
Fig. 27. The secondary layers of a ligneous cell of Piscidia Ery- 
thrina, swollen in sulphuric acid. 
Fig. 28. A ligneous cell of Piscidia Erythrina, in its natural state. 
Fig. 29. Transverse section of a ligneous cell of Taaodium disti- 
chum, swollen in sulphuric acid. The primary membrane has become 
detached and is not represented. 
Fig. 30. Ligneous cell of Zaxodiwm distichum, in its natural con- 
dition. 
Fig. 31. Longitudinal section of a ligneous cell of Tawodium di- 
stichum. 
Fig. 32. Hair of the seed-membrane of Ruellia strepens, treated with 
iodine. The mucilaginous cellular layers with the primordial utricle 
project from the external membrane in consequence of the swelling 
in water. 
Fig. 33. Primary membrane of the cells of Polypodium incanum 
(fig. 18), swollen in sulphuric acid. 
Fig. 34. A portion of the secondary cell-layers of Taxodium di- 
stichum, treated with sulphuric acid. 
