DR. M. J. SCHLEIDEN ON PHYTOGEXESIS. 311 



a higher po%ver. The strata-Hke depositions (near b.) upon the 

 inner wall, and the porous canals (near a.) produced by their 

 local failui-e are apparent. I could distinctly count nine to 

 twelve layers which had originated within fourteen days. 



Fig. 11. A spore fi'om Rhizina IcBvigata, Fries, with the cyto- 

 blasts. ^ 



Figs. 12 — 14. Several cytoblasts from the embryo sac of Pi- 

 melea drupacea before the appearance of cells. 



Fig. 15. Young cells with their cytoblasts from the same. The 

 latter here unquestionably present three nuclei. 



Fig. 16. A portion of the embiyonal end of the pollen-tube 

 projecting from the ovulum in Orchis Morio, in which towards 

 the upper part cells have already developed. Below, the original 

 pollen-tube is still distinguishable. The almost globular cyto- 

 blasts in this case are distinctly included in the cellular wall. 



Fig. 17. Embryonal end of the pollen-tube from Linum pal- 

 lescens, together with the appended lobule of the embryo sac 

 (a.). The process of the fn'mation of cells is in its beginning. 

 Above, a young cell with its cytoblasts is already perceptible ; 

 beneath this are seen several cellular nuclei floating in a free state. 



Fig. 18 — 20. Commencement of the germination in the spores 

 oi Mar chantia poly morjiha. Compare the text, p. 297. 



Fig. 2 1 . Portions of the pollen-tube become cellular in Orchis 

 latifolia in the highest stage of development. The covering de- 

 rived from the pollen-tube is no longer perceptible. The cyto- 

 blast is exactly as in Fig. 16. included in the wall of the cell. 



Figs. 22 and 23. Two isolated cells from the terminal shoot 

 [punctum ver/etationis, Wolff.) of Gasteria racemosa; in 22, 

 two free cytoblasts are seen ; in 23, two newly formed cells in the 

 original cell. 



Fig. 24. A very young leaf of Crassula portulacea, the five cells 

 solely composing it are still surrounded by an original cell. 



Fig. 25. Three cells from an articulated hair of a potatoe, with 

 a quantity of currents of mucus at the sides, giving them a re- 

 ticulate appeai'ance. In the middle cell the direction of the cur- 

 rents is partly indicated by arrows. 



Wherever hitherto I have observed in Phanerogamia these 

 movements in the cells, I have constantly found that the moving 

 part consisted of a yellowish gelatinous fluid, perfectly insoluble 

 in distilled water, and mixed with a quantity of minute black 

 granules, differing entirely from the other aqueous cellular sap ; 

 and even where the currents w^ere so minute that they appeared 

 merely as excessively minute delicate lines of black points, yet 

 I succeeded with higher magnifying powers in distinguishing 

 the yellowish gelatinous fluid, especially with the favourable cir- 

 cumstance, which frequently occurs, of the cun-ent being ar- 

 rested by some preventive, thus causing a somewhat large quan- 



