382 SKETCH OF PALEOBOTANY. 



selves for joining parties of exploration in the far West, and he finally 

 became a member of the celebrated Ives Exploring Expedition. With 

 a special fondness for geology and mining he combined a deep interest in 

 paleontology, in all of which specialties he has distinguished himself. 

 The Carboniferous formation of Ohio had early interested him much, 

 and especially the vegetable remains found embedded in it, and as far 

 back as 1853 we find him reading papers before the American Associa- 

 tion, "On the structure and affinities of certain fossil plants of the Car- 

 boniferous era," and "On the Carboniferous Flora of Ohio, with descrip- 

 tions of fifty new species of fossil plants."^" In 1859 he reported upon 

 the fossils, including plants, of the Macomb Exploring Expedition, ^^ in 

 1861 those of Lieutenant Ives's Expedition,'^ and in 1863, those of the 

 Northwest Boundary Commission. '^ Probably the most important of his 

 paleobotanical memoirs thus far published was his "Notes on the Later 

 Extinct Floras of North America," which appeared in the Annals of the 

 New York Lyceum of Natural History for April, 1868. No plates ac- 

 companied this memoir, but a large number of the plants described had 

 been figured by Dr. Newberry, which he had expected to be published 

 by the Geological Survey of the Territories, but none appeared until 

 1878.3* He has, however, been more or less constantly engaged since 

 that time in figuring the large collections which have been reaching him 

 each year at the School of Mines, and over one hundred plates have, up 

 to the present writing, been prepared, most of which are printed and 

 awaiting the text of a large work which will be published by the United 

 States Geological Survey. 



20. Schenlc. — Hofrath Dr. August Schenk, professor of botany at 

 the University of Leipsic, was born at Hallein, Upper Austria, in 1815, 

 and held the chair of botany at Miinich and Wurzbach before being 

 called to that of Leipsic. His paleobotanical researches have been 

 chiefly directed towards a Httle known horizon lying between the Bunt- 

 ersandstein and the Lias, and upon this dark region they have shed a 

 flood of light. His earlier papers ^s related to fossil plants from the Keu- 

 per, chiefly collected in the vicinity of Bamberg and Bayreuth, and, in 

 addition to material collected by himself and Dr. Kirchner, he elaborated 

 that brought together by the Count of Miinster, but later he turned his 

 attention to some rich plant beds overlying these strata and situated in- 

 termediate between them and the Lias. It is upon this narrow horizon 



30 T 



'"Proceedings, pp. 1S7-166. 



'' Report of the Expedilion, pp. 142-148, PI. IV-VIII. 



32 Report upon the Colorado River of the West, hy Lieut. Joseph C. Ives, Washington 

 1861, pp. 129-132., PI. III. ' 



^'i Boston Journal of Natural History, Vol. VII, 1863, pp. 506-524. 



s-i Illustrations of Cretaceous and Tertiary plants. Washington, Government Printiiiff 

 Office, 1878. ^ 



=5 The earliest seems to have heen "Ueher einem iu der Keuperformatlon bei Wurz- 

 bnrg aufgefundenen fossilen Farnstamm (Chelepteris strongylopeltis). Verhandluu- 

 gen der Wiirzhurger physicalisch— medioinsohen Gesellschaft, Band VIII 1858 ub 

 212-216. ' ' ^^' 



