100 PLANT ANATOMY. 
The glodoids dissolve in inorganic acids, also in acetic and 
tartaric acids, but not in a dilute solution of potassa. 
There occur, moreover, in the vegetable kingdom, crystal- 
loids which are not inclosed in aleurone granules (the potato, 
Fig. 108 a). 
The aleurone granules, as is already indicated by their exclu- 
sive occurrence in seeds, belong to the reserve substances which 
have the function of presenting to the germinating plant, in its 
first development, and before it is capable of assimilating inde- 
pendently, sufficient material for building up its organs. They 
are, therefore, of the greatest importance in the economy of the 
plant. How abundantly protein substances are contained in 
some seeds is shown by the following figures, showing their per- 
centage: Nux vomica, 11; Cacao, 13 ; Black Mustard, 18 ; 
Almond, 24; Linseed, 25 3 Lgnatia seed and White Mustard, 27. 
These numbers are calculated from nitrogen estimations, with 
the presupposition that albuminous bodies contain 15 per cent 
of nitrogen. 
With the albuminous bodies are directly connected the ehlo- 
rophyll bodies, the fundamental mass of which likewise consists 
of an albumen-like substance.' This fundamental mass (stroma), 
which, moreover, is also very soft, is of a sponge-like structure 
(Fig. 33 a), and contains in the meshes of the frame-work a 
small amount of the mixture of coloring substances, to which 
Pelletier and Cayentou? in the year 1817 gave the name “ chlo- 
rophyll.”* The crude chlorophyll consists of two coloring mat- 
_ ters, chlorophyll in a more restricted sense, or pure chlorophyll,* 
and xanthophyll.* The former is bluish-green, the latter yel- 
E ' Sachs, ‘‘ Flora,” 1862 and 1863.—Mohl, ‘‘ Verm. Schriften.” 
* Journ. de Pharm., 1817, p. 486. 
* XAwpos green, and guAdor leaf. 
“Compare Tschirch, ‘* Untersuchungen fiber das Chlorophyll,” Berlin, 
1884, In this publication, the entire literature relating to chlorophyll 
‘to the year 1883 is ¢ 
ritically sifted aud reviewed. At the close of the 
work, a catalogue of the literature is given, comprising nearly 600 in- 
vestigations, 
° Zav Sos yellow, and pvAAor leaf. 
