- German physiologist and histologist who in 1838 formulated the cell theory (1804-1881)
How To Use Schleiden In A Sentence
-  In _Passiflora_ the organogeny of the flower clearly shows the truth of this assertion, as was indeed shown by Payer and Schleiden. Vegetable Teratology An Account of the Principal Deviations from the Usual Construction of Plants
- Schleiden, and accepted by Schwann, the connection between the three co-existent cell-constituents was long thought to be of this nature: that the nucleolus was the first to show itself in the development of tissues, by separating out of a formative fluid (blastema, cyto-blastema), that it quickly attained a certain size, that then fine granules were precipitated out of the blastema and settled around it, and that about these there condensed a membrane. The World's Greatest Books — Volume 15 — Science
- It cannot even now be said that the fundamental forms of vegetable structure have been precisely determined; some, with Schleiden himself, finding a radical twofoldness, and others aiming to establish a unity  as the most general plan of the plant. Theism: The Witness of Reason and Nature to an All-Wise and Beneficent Creator.