THE CELL. 95 
cated composition, very rich in nitrogen,’ which contains several 
substances belonging to the albumen group (protein substances), 
together with water and inorganic salts (phosphates and sul- 
phates of the light metals). Itis not devoid of structure, but 
possesses a fine organization.* 
Substances capable of abstracting water (such as sugar and 
glycerin) contract the protoplasm, 7. ¢., in consequence of the 
Fic. 27.—Transverse section through a medullary cell of Toxodium distichum. a, 
nucleus ; b, nucleolus ; c, protoplasm-sae contracted toward the wall (separated from 
the latter by reagents) ; i, primordial utricle (hyaloplasm) ; p, cell-sap; -m, correspond- 
ing tips of adjacent cells ; d, the cell-wall ; e-s, the cell-walls of adjacent cells ; g, inter- 
cellular space (Hartig), : 
elimination of water from the contents of the cell, the proto- 
plasm-sac is drawn from the cell-wall. Protoplasm is colored 
1 Compare Reinke, “Studien tiber das Protoplasma,” Berlin, 1881. 
2 Very many investigations have recently been published, relating to — : : 
the structure of protoplasm (especially by Strasburger, Schmitz, Tangl, 
