16 



CHEMISTRY OF PLANTS. 



10. Very marked in the Rhizoma of Iris florentina, and in the kindred 

 species (fig. 8.). 



9. 



2. Flatly. compressed lenticular 

 Granules. 



11. Sometimes with, sometimes with- 

 out, a decided lamellated formation ; 

 sometimes with a central, or excentric, 

 or less rounded, or more elongated, 

 or radiated torn-up cavity. In the 

 albumen of Triticum, Hordeum, Secale 

 (fig. 9.). 



3. Perfectly flat Discs. 



12. With more distinct layers, 

 in which it is, however, at times 

 doubtful whether they pass 

 entirely round, or are only 

 menisci laid over one another. 

 The former appears to me pro- 

 bable, owing to analogy, and the 

 phenomena presented in roast- 

 ing and on dissolving in sul- 

 phuric acid. We do not find 

 it in the rhizoma of all the 

 Scitaminece, as Meyen attests, 

 but exclusively in the Zingi- 

 beracecB Lindl. ; neither in the Cannacece, nor in the Marantacece 



(fig. 10.). 



4. Elongated Corpuscles. 



13. With an elongated central cavity in the milk -juice of the indi- 

 genous, and a few of the tropical, EuphorbiacetB. 



5. Perfectly irregular Bodies. 



14. In the milky juice of many tropical Euphorbiacece. 



III. COMPOUND GRANULES. 



Here we only find simple granules, by way of exceptions, in the plant, 

 or part of the plant. 



1. The separate Granules in the Composition without evident 

 central Cavity. 



15. Compounded, according to the simplest types in 2, 3, or 4 in the 

 rhizoma of Marantacece (West Indian Arrow-root) (fig. 11.). In the 

 tubers of Aponogeton ; in the thickened vagination of the leaves of 

 Marattia ; in the root of Bryonia. 



9 Granules of starch from the albumen of the seed of Secale cereale : a is seen from 

 the surface, 6 from the edge. The difference of size, without any intervening stages, is 

 striking in Secale, Triticum, Hordeum, &c. 



10 Granules of starch from the rhizoma of Curcuma leucorrhiza (East Indian arrow- ^ 

 root). Very flat discs seen at a from the surface, and at b from the margin. f j? 



\f 



