ALEURONE. 99 
the aleurone granules of the seeds of Elwis guineensis, dithusa 
Cynapium, and all Euphorbiaces (Ricinus, Croton); they are 
wanting in the aleurone granules of umbelliferous seeds. Crys- 
talloids occur, together with crystals, in Asthusa Cynapium. 
Occasionally an aleurone granule in each cell is distinguished 
from the others, either by its size alone, or also by inclosing 
crystals of a different formation or larger size (Fig. 31 A at ¢). 
Such a granule is termed solitary (German, solitdér, Hartig). 
The erystalloids are doubly refractive,’ their angles, however, 
are inconstant; they are insoluble in water. The aleurone 
granules free from crystalloids, on the contrary, dissolve for 
Fie, 31.—A, Two gluten-cells from the seed of the raisin. In the cell at the left much 
granular protoplasm anda nucleus cis present, The cell at the right, after complete 
ripening, with a large, solitary granule (c), and numerous, small aleurone granules. B, 
Aleurone from the seed of Ricinus communis with ecrystalloids. C, Aleurone from 
Euphorbie, Myristica (c), Croton (b), Phyllantus (bb). D, Aleurone from the seed of 
Bertholletia excel: , f dissolution of a crystalloid into several crystals. Z, Aleurone from 
the seed of Liipinis (ec) and Contum (d) (Htartig). : 
the most part in pure water (Pwonia, Lupinus), and all of thine oe 
in feebly alkaline water. The fundamental mass, consisting of 
protein substances, is insoluble in alcohol, ether, benzol, chloro- foe 
form, and paraffin; it is colored yellow by iodine. ae 
‘They therefore appear more clearly in polarized light. Ds ape ee 
ee oe oe emp aay 
