Elements of biology, with special Elements of biology, with special reference to their rôle in the lives of animals elementsofbiolog00buch Year: 1933 72 ELEMENTS OF BIOLOGY gaseous wastes are also excreted as in amcebae. In fact, this direct transfer of materials through the cell wall is common to all cells of all animals. In complex multicellular organisms additional ma- chinery is provided whereby these substances may be conveyed to and from the cells, but the essential facts concerning the processes as regards each cell are identical in amoeba, paramoecium, or Man. ZOOCHLORELLA

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