404 SKETCH OF PALEOBOTANY. 



which appeared in 1819 or 1820, the last uamed of which contains the ear- 

 liest descriptions of the plant remains of the interesting locality of Hor, 

 in South Sweden, afterward more carefully studied by Brongiiiart,!'" 

 we find in the year 1820 three treatises of prime importance : Ehode's 

 " Piianzenkunde der Vorwelt,'"'*^ Schlotheim's "Petrefactenkunde," 

 (supra, p. 371), and Sternberg's " Flora der Vorwelt" (supra, p. 371). 

 Rhode studied the coal plants of Silesia, and was the predecessor of 

 Goppert in that line of work. He discovered the now well-known fact 

 that tbick stems often silicify within while carbonizing without, which 

 he discussed as well as the questions treated by Schlotheim and his 

 predecessors relative to the real nature of plant impressions. He fig- 

 ured Lepidodendron, Sigillaria, and other coal plants, and his plates 

 are still frequently quoted. Like Lehmann, he mistook certain verticil- 

 late forms for flowers, but represented them none the less faithfully. 

 His work was never finished, being interrupted by the premature death 

 of the author. Sternberg treated the subject of vegetable remains 

 both from the geognostic and the botanical points of view, and his work 

 was undoubtedly the most advanced contribution that had been made 

 up to this date. We have already referred to it in a general way, and 

 as its chief interest centers upon the system of classification which he 

 proposed we must defer the more detailed account of it until this sub- 

 ject is reached. Less than an eighth of Schlotheim's "Petrefacten- 

 kunde" is devoted to plants, but it is systematically arranged, and the 

 families, genera, and species are named according to the binomial 

 method of Linnseus, giving the work a decidedly modern appearance. 

 About the only other work referred to in it is his own "Flora der Vor- 

 welt," the plates of which are reproduced, and others added. He had 

 evidently not met with the paper of Steinhauer, and appeared not to 

 be aware of the labors of Sternberg. 



These works gave a new impetus to the science of fossil plants, and 

 in the following year a number of papers appeared describing discov- 

 eries in special localities in Germany,'^" France,"^ Bngland,^*^ and 

 America.^''' In this year also appeared Adolphe Brongnlart's first and 

 very important paper on the classification and naming of fossil plants, 



'^Aunales des Science Naturelles. Tome IV, p. 200. PI. XI, XII. Paris, 1825. 



"' J. G. Rbode. Beitrage zur Pflanzenkunde der Vorwelt. Breslau, 1820. 



™B. S. vouNau. Pflanzetiabdriicke und Versteinerungeu aus dem Kohlenwerke 

 von St. Ingbert im baierischen Rheinkreis verglichen mit lebenden Pflanzen aus 

 warmeren Zonen. Denksohr. der kongl. Akad. d. Wiss. zu Miiuclien, Band VII, 1821, 

 S. 283. 



'"Alexandre Brongniart. Notice snr des V(5g6taux fossiles traversant les coucliea 

 du terrain liouiller. Aunales des Mines, Tome VI, 1821, pp. 359-370. 



'o^Tbomas Allan. Description of a vegetable impression found in the quarry of 

 Craigleith. Trans. Eoy. Soc, Edinb., Vol. IX, 1828, p. 235. 



Patrick Brewster. Description of a fossil tree found at NitesMU, etc. Loc. cit., 

 p. 103, PL IX. 



'«» Ebenezer Granger. Notice of vegetable impressions on the rocks connected with 

 the coal formation of Zanesville, Ohio. Am. Jouru. Sci., l^'ser.. Vol. Ill, 1821, p. 5. 



