220 LEMNACE. 
‚ 4. Do., more advanced, a outer sheath; ё its open apex 
ruptured by growth of c, inner do., which is the per- 
manent one; d radicle. 
5. Section of do., shewing that diei true sheath, is solid, 
and that кач: to its capability of being excavated 
is its attachment continued ; @ base of outer sheath, r 
inner long section ; c radicle. 
. More advanced ; а outer sheath; 5 inner, now much 
projecting, c its place of separation from the axis, d 
radicle. 
More advanced, a outer sheath, б its mouth, c inner 
do., d radicle, the opaque lines are so from air. 
8. Bundle of raphides contained in a cell of outer sheath, 
these bodies abound in Lemna. 
It is evident from this, that authors have been mistaken 
about the sheath, the inner and permanent one being always 
distinct from the outer, which is analogous to the usual sheath 
of Endorhize, the inner being a portion of the root itself. 
I have not been able to see the exact modes of exit of 
this, whether it is by carrying off the conical top of the 
outer (see 3,) or by lateral tearing, the mouth of the outer - 
sheath is irregular. 
Lemna major of Calcutta. Pi. CCLXIV. Fig. II. 
I. Fruit bearing plant. 
2. Fruit. 
3. Do., long section. 
4. Seed. 5, do., long section through integument. 
6. Inner tegument and its enclosures. 
7. Same, long section shewing the embryo. 
8. Embryo with its curious footstalk. 
9. Same, line shewn, is this the same line that Brongniart 
figures as communicating with the chalaza ? 
10. Pressure employed, plumule shewn at a, something 
Approaching dicotyledonary structure, but as the embryo 
is not fully developed, perhaps it is due to immaturity of 
the central tissue. 
с 
“I 
