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See also:MOHL, See also:HUGO VON (1805–1872) , See also:German botanist, was See also:born at See also:Stuttgart on the 8th of See also:April 18o5. He was a son of the See also:Wurttemberg statesman See also:Benjamin See also:Ferdinand von Mohl (1766–1845), the See also:family being connected on both sides with the higher class of See also:state officials of Wurttemberg. While a See also:- PUPIL (Lat. pupillus, orphan, minor, dim. of pupus, boy, allied to puer, from root pm- or peu-, to beget, cf. "pupa," Lat. for " doll," the name given to the stage intervening between the larval and imaginal stages in certain insects)
pupil at the gymnasium he pursued See also:botany and See also:mineralogy in his leisure See also:- TIME (0. Eng. Lima, cf. Icel. timi, Swed. timme, hour, Dan. time; from the root also seen in " tide," properly the time of between the flow and ebb of the sea, cf. O. Eng. getidan, to happen, " even-tide," &c.; it is not directly related to Lat. tempus)
- TIME, MEASUREMENT OF
- TIME, STANDARD
time, till in 1823 he entered the university of See also:Tubingen. After graduating with distinction in See also:medicine he went to See also:Munich, where he met a distinguished circle of botanists, and found ample material for See also:research. This seems to have determined his career as a botanist, and he started in 1828 those anatomical investigations which continued till his See also:death. In 1832 he was appointed See also:professor of botany in Tubingen, a See also:post which he never See also:left. Unmarried, his pleasures were in his laboratory and library, and in perfecting See also:optical apparatus and microscopic preparations, for which he showed extraordinary See also:manual skill. He was largely a self-taught botanist from boyhood, and, little influenced in his opinions even by his teachers, preserved always his See also:independence of view on scientific questions. He received many honours during his lifetime, and was elected See also:foreign See also:fellow of the Royal Society in 1868. Von Mohl's writings See also:cover a See also:period of See also:forty-four years; the most notable of them were republished in 1845 in a See also:volume entitled Vermischte Schriften- (For lists of his See also:works see Botanische Zeitung, 1872, p. 576, and Royal See also:Soc. See also:Catalogue, 187o, vol. iv.) They dealt with a variety of subjects, but chiefly with the structure of the higher forms, including both rough See also:anatomy and See also:minute See also:histology. The word See also:protoplasm " was his See also:suggestion; the See also:nucleus had already been recognized by R. See also:- BROWN
- BROWN, CHARLES BROCKDEN (1771-181o)
- BROWN, FORD MADOX (1821-1893)
- BROWN, FRANCIS (1849- )
- BROWN, GEORGE (1818-188o)
- BROWN, HENRY KIRKE (1814-1886)
- BROWN, JACOB (1775–1828)
- BROWN, JOHN (1715–1766)
- BROWN, JOHN (1722-1787)
- BROWN, JOHN (1735–1788)
- BROWN, JOHN (1784–1858)
- BROWN, JOHN (1800-1859)
- BROWN, JOHN (1810—1882)
- BROWN, JOHN GEORGE (1831— )
- BROWN, ROBERT (1773-1858)
- BROWN, SAMUEL MORISON (1817—1856)
- BROWN, SIR GEORGE (1790-1865)
- BROWN, SIR JOHN (1816-1896)
- BROWN, SIR WILLIAM, BART
- BROWN, THOMAS (1663-1704)
- BROWN, THOMAS (1778-1820)
- BROWN, THOMAS EDWARD (1830-1897)
- BROWN, WILLIAM LAURENCE (1755–1830)
Brown and others; but von Mohl showed in 1844 that the protoplasm is the source of those movements which at that time excited so much See also:attention. He recognized under the name of " primordial utricle " the protoplasmic lining of the vacuolated See also:cell, and first described the behaviour of the protoplasm in cell-See also:division. These and other observations led to the overthrow of J. M. See also:Schleiden's theory of origin of cells by See also:free-cell-formation. His contributions to knowledge of the cell-See also:wall were no less remarkable; he held the view now generally adopted of growth of cell-wall by apposition. He first explained the true nature of pits, and showed the cellular origin of vessels and of fibrous cells; he was, in fact, the true founder of the cell theory. Clearly the author of such researches was the See also:man to collect into one volume the theory of cell-formation, and this he did in his See also:treatise See also:Die vegetabilische Zelle (1851), a See also:short See also:work translated into See also:English (See also:Ray Society, 1852). Von Mohl's See also:early investigations on the structure of palms, of cycads, and of See also:- TREE (0. Eng. treo, treow, cf. Dan. tree, Swed. Odd, tree, trd, timber; allied forms are found in Russ. drevo, Gr. opus, oak, and 36pv, spear, Welsh derw, Irish darog, oak, and Skr. dare, wood)
- TREE, SIR HERBERT BEERBOHM (1853- )
tree-ferns permanently laid the See also:foundation of all later knowledge of this subject: so also his work on Isoetes (184o). His later anatomical work was chiefly on the stems of See also:dicotyledons and See also:gymnosperms; in his observations on See also:cork and bark he first explained the formation and origin of different types of bark, and corrected errors See also:relating to lenticels. Following on his early demonstration of the origin of stomata (1838), he wrote a classical See also:paper on their opening and closing (1850). In 1843 he started in See also:conjunction with F. Schlechtendal the weekly Botanische Zeitung, which he jointly edited till his death. He was never a See also:great writer of comprehensive works; no See also:text-See also:book exists in his name, and it would indeed appear from his withdrawal from co-operation in W. F. B. See also:Hofmeister's Handbuch that he had a distaste for such efforts. In his latter years his productive activity See also:fell off, doubtless through failing See also:health, and he died suddenly at Tubingen on the 1st of April 1872.
See See also:Sachs, See also:History of Botany, p. 292, &c.; De Bary, Botanische Zeitung (1872), p. 561; Proc. See also:Roy. Soc., See also:xxiii. 1; Allgemeine Deutsche Biographie, xxii. 55. (F. 0.
End of Article: MOHL, HUGO VON (1805–1872)
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