EXPLANATION OF THE FIGURES. 



PLATE I. 



ANTHOCEROS I^EVIS. 

 FIG. 



1. Germ-plants seen from above, x 15.* 



2. Shoot of a plant cultivated for some time in a room under a hand-glass, 



X 15. 



3. Longitudinal section through an actively growing shoot, perpendicular to 



the surface. The contents are only shown in the cells of the fore-edge. 

 The youngest cell of the second degree belongs to the upper side of the 

 shoot. The fore-edge of the shoot is surrounded by a layer of mucilage, 

 hardened on the outside, to which grains of dust and sand adhere. 

 X 300. 



4. A similar preparation . The section has passed through three archegonia in 



process of development, x 300. 



5. A young shoot seen from above, X 300. 



6. Fore-edge of a half-developed shoot in the epidermal cells of which the 



final division is going on, x 300. 



7. A young shoot ; on the right and left of the middle shoot are the two 



rudimentary lateral shoots, seen from above, x 300. 



8. Transverse section of a delicate young shoot, X 200. 



9. Cells of the interior of a perfect shoot cut through longitudinally, and 



which, abnormally, contain two chlorophyll-granules, x 300. 



10. Portion of a section perpendicular to the surface of a perfect shoot, treated 



with caustic potash, X 300. 



11. Portion of the inner tissue of a longitudinal section of a perfect shoot. 



One of the cells — that one whose contents are figured — shows the com- 

 mencement of the formation of a gemma. X 300. 



12. A further developed gemma cut through parallel to the surface of the shoot 



in which it was formed, X 300. 



13. A gemma which has sent out a capillary root whilst still within the decay- 



ing tissue of the mother-shoot, X 100. 



14. Chlorophyll-bodies from one of the cells of the wall of a young fruit, 



X 400. 



* " X 15" means "magnified 15 diameters," and so on all through the 

 figures. 



