Explanation of plate 20 
crystals no attempt was made to show the crystals in perspective. Apices 
merely are outlined. Fics. 1,2 and 3 are magnified approximately 1950 times; 
Fics. 4 and 5, approximately 980 times. 
Fic. 1. Subepidermal cell from a perianth part with nucleus almost cen- 
trally placed in the vacuolated ytoplasm. A small stellate crystal appears 
to lie in one of these vacuoles. 
. Crystal-containing cell from the perianth. The protoplast is 
shrunken and drawn away from the cell wall but in the large central vacuole 
appears a small crystal with a very delicate strand-like attachment to the 
vacuolar membrane. 
Fic. 3. A normal parenchymatous cell from a ‘perianth part with a 
crystal-containing cell of approximately equal size adjoining it 
1G. 4. Iwo cells from the pith of the central axis of the spadix, con- 
trasting the isodiametric shape of the larger aggregate crystal-containing cell 
with the adjoining cell. Nuclei and primordial utricle with chloroplasts are 
comparable in the two. 
Fic. 5. A large aggregate of crystals occupying almost the entire lumen 
of the cell. Some of the crystals nearly reach the cell wall by extending into 
the thin primordial utricle. Nucleus still clearly visible. 
