420 
Fig. 3. 
~J 
10. 
TL 
12. 
13. 
Mr. Bowman on the Lathrea Squamaria, $c. 
'l'ransverse section of a tuber and its vessels. 
. Perpendicular section of a tuber at an early stage of its 
attachment to the bark. a,b,c, d. The bark, albur- 
num, solid wood, and pith of the tree-root.— Fig. 1. 
2. 3. & 4. are all highly magnified. 
Transverse section of the cavity formed in the root of 
the Ash under an old decayed tuber, with the sur- 
sounding border of the new liber to check the pro- 
gress of the injury :—highly magnified. 
. Exterior surface of a subterranean leaf. The dotted 
line a, b indicates the direction of the inclosed space 
which communicates with the interior chambers. 
. Perpendicular section of ditto, and one of its chambers. 
Transverse section of ditto passing through its imbedded 
chambers.—Fig. 6. 7. & 8. are equally magnified. 
. The lower portion of Fig. 7. enlarged ad libitum, to 
show the passage by which air is admitted into the 
cells of the leaf, in the direction of a,b. b. Is the 
space inclosed by the incurvation of the base of the 
leaf, d; and c. The orifice into the cell, f. e. The 
leafstalk. | 
Transverse section of a leaf, more highly magnified than 
Fig. 8, showing its cellular texture, and the convolu- 
tions of the chambers, with their papilla. 
One of the chambers of ditto, still more highly magni- 
fied, to show more distinctly the papille scattered over 
its inner surface. 
a,b,c. The papillz very highly magnified. d,&e. Per- 
pendicular and transverse sections of ditto, showing 
their valves and interior cells. 
Minute pear-shaped bladders lodged within the cavities 
of the cellular substance of the leaf. : 
XXI. On 
SS a 
Att PI te s mane 
