...endogenous cell formation. This account of cell development provided the foundation to the cell doctrine: "The elementary parts of all tissues are formed of...however different, and that this principle is the formation of cells" (p. 165). Given that other investigators were already describing cell division,...

...blocks of both plants and animals. But it was Schleiden and Schwann who clearly and boldly asserted, "There is one universal principle of development for...elementary parts of organisms, however different, and this principle is the formation of cells." The first serious attack on spontaneous generation came...

...indebted for the discovery of the beautiful theory of cell development, by which it has been proved that " the elementary parts of all tissues are formed of...however different, and that this principle is the formation of cells. A structureless substance — as the liquid germ of the vegetable, and the liquor...

...development, between animals and plants." Further on in his work, in the philosophical part, he says, "The elementary parts of all tissues are formed of...however different, and that this principle is the formation of cells." In referring to the cell theory he states "The development of the proposition...

...multiplication of this initial cell into the multitude of different kinds which constitute the adult: "The elementary parts of all tissues are formed of...in an analogous, though very diversified manner, so it may be asserted that there is one universal principle of development for the elementary parts of...

...expression and make it germinal of other discoveries. And when Schwann put forward the explicit claim that "there is one universal principle of development...elementary parts of organisms, however different, and this principle is the formation of cells," he enunciated a doctrine which was for all practical purposes...