552 
EXPLANATION OF THE PLATES. 
N. B. AH the figures in the plates, of which the following is an explanation, 
are more or less magnified : the drawings from which they have been pre- 
pared are in all cases original, except where it is stated to the contrary. 
PLATE I. 
Fig. 1. A small portion of a section of the cellular tissue of the pith of Caly- 
canthus floridus, showing the pore-like spots upon the membrane. 
Fig. 2. A section of the leaf of Lilium candidum, after A. Brongniart; a, cu- 
ticle of the upper surface ; b, ditto of the lower surface ; c, stomata cut through 
in different directions ; these last are seen to open into cavities in the paren- 
chyma; d, upper layer of parenchyma; e, intermediate ditto ; J", lower ditto. 
Fig. 3. Cubical cellular tissue, passing gradually into prismatical, from the stem 
of the gourd, cut vertically ; after Kieser. 
Fig. 4. Fibres forming arches in the cndothecium of Linaria cymbalaria; after 
Purkinje. 
Fig. 5. Fusiform cellules in the wood of a young branch of Viscum album ; 
after Kieser; o, common hexagonal cells of the pith, with grains of amydon 
sticking to their sides; b, fusiform cellules, considered by Kieser to be pierced 
with holes ; c, other cells of the same figure, with lines of dots spirally arranged 
on the membrane ; d, others, in which the dots are run into lines; e, f, others, 
in which the cellules have all the appearance of short spiral vessels. Kieser 
considers these not as spiral vessels, but as cellules of a peculiar kind, replacing 
spiral vessels in the viscum. 
Fig. 6. A portion of the cuticle of Billbergia amaena, with the membrane torn 
on one side, showing that it does not tear with an even edge, but breaks into 
little teeth. 
Fig. 7. Muriform cellular tissue, forming the medullary processes of Platanus 
occidentalis. Eacli cellule contains particles of brownish matter of very 
irregular size and form. 
Fig. 8. a, Glandular hairs of the peduncle of Primula sinensis; 1, the glandular 
apex more highly magnified, witli a particle of the viscid secretion of the species 
on its point ; 2, the apex of another hair, showing that the end is open, a coni- 
cal piece of the viscid secretion lying in the orifice : b, a hair of Dorstenia, 
showing the cellular base from which it arises, and that it consists of a single 
hollow conical curved cell. 
Fig. 9. A branched hair from the cilia of the leaf of a sj)ecics of Verl)ascum. 
Fig- A. A simple coloured hair in Dichorizandra rufa. 
Fig, B. A hair with tumid articulations from the leaf of Gesneria tuberosa. 
