THE ASSIMILATING SYSTEM. 209 
tion, a longitudinal cleft is also occasionally found in ‘the en- 
dosperm (Strychnos Nua vomica, Coffea *). 
‘Fic. 126,—Longitudinal section throngh Radix Sarsaparille; e, epiblema; p. hairs; 
cc’, cells of the bark, which are thickened on one side; d, parenchyma; 0, calcium 
oxalate, 
4. The Assimilating System. 
The assimilating tissue serves primarily for the formation of 
organic substance from carbonic acid and water under the in- 
fluence of light, to which procedure the name of assimilation 
has been given. This tissue is filled with chlorophyll granules 
‘(compare page 100), and its cells possess forms which tend, as 
far as possible, to the transmission of light on all sides, and the 
rapid removal of the products of assimilation.’ a 
| Jager, “ Endosperm der Coffea.” Bot. Zeit., 1881, p. 336. ae 
‘Compare in this connection Haberlandt, in Pringsheim’s Jahrb., 
xiii. (1881), ae pon 
44 
