F. W. Simonds — Life of Dr. Ferdinand von Roemer. 415 



a few other than those already alluded to in the preceding pages. 

 During the years 1852-1854: he published in connection with its 

 author a revision of H. G. Bronn's " Lethaea geognostica oder 

 Abbildung und Beschreibung der fiir die Gebirgs-Formationen 

 bezeichnendsten Versteinerungen. Bd. i, 2: Palaeo - Lethaea ; 

 Kohlen-Periode (Silur, Devon, Kohlen- und Zechstein-Formation)." 

 More than twenty years later we find him again engaged upon an 

 enlarged and revised edition of this work. The atlas, with &5 plates, 

 appeared in 1876 ; in 1880 the first part of the text, and in 1883 

 the second part. It is a matter of regret that he did not live to 

 complete this undertaking. In 1861 he published " Die Fossile 

 Fauna der Silurischen Diluvial-Geschiebe von Sadewitz bei 01s in 

 Niederschlesien." This was in the form of a " Gratulationsschrift " 

 of the Silesian Society to the Breslau University at its jubilee held 

 that year. 



In July, 1862, the preparation of a geognostic map of Upper 

 Silesia on the scale of 1 : 100,000 was authorized by the Prussian 

 Ministers of Commerce, Trade, and Public Works, and Roemer 

 was selected to direct its construction. For eight years, assisted 

 by 0. Degenhard, H. Eck, and A. Halfar, he devoted himself to this 

 work, and at the same time made numerous short contributions 

 announcing new discoveries in the geology and palgeontology of that 

 region. These served as forerunners of the " Geologic von Ober- 

 schlesien," a work in three volumes, published in 1870, which 

 contained the complete results of the investigations of himself and 

 his assistants. The great value of this publication is evident when 

 we take into consideration that up to this time little was known of 

 the geology of the province, which had long been famous for the 

 value of its mineral deposits. 



After the publication of this work he found time not only to 

 rewrite portions of " Lethaea Palaeozoica," to which reference has 

 already been made, but to prepare numerous smaller conti'ibutions 

 treating of his investigations and studies, among which may be found 

 the first observations upon the discovery of diluvial mammals in the 

 low plain of Northern Germany, especially in Silesia and Poland. 

 So great was his interest in this direction that later he undertook an 

 investigation of the Polish bone caves, concerning which he published 

 in 1883 a large work bearing the title " Die Knochenholen von 

 Ojcow in Poland" (Paleeontographica, xxix). This was translated 

 into English by John Edward Lee, under the title " The Bone Caves 

 of Ojcow in Poland," and published the following year in London. 



As further evidence of Eoemer's great activity, it may be remarked 

 that he had already prepared and published (1880) a description of 

 the Carboniferous Limestone fauna of the west coast of Sumatra — 

 " Uber eine Kohlenkalk Fauna der Westkiiste von Sumatra " 

 (Palasontographica, xxvii) — based upon a fine collection sent him 

 in 1876 by Verbeek. 



In 1885 appeared "Lethaea erratica " (Palaeont. Abband. von 

 Dames u. Kayser, Bd. ii, 5, Berlin), embracing an enumeration and 

 description of the boulders occurring in the North German plain. 



