No. 1, July, 1920] PALEOBOTANY 183 



1205. FLORIN, R. Eine iibersicht der fossilen Salvlnia-arten mit besonderei beriicksch- 

 tigung eines fundes von Salvinia formosa Heer in Tertiar Japans. [A review of the fossil species 

 of Salvinia with special reference to a discovery of Salvinia formosa Heer in the tertiary of Japan. ] 

 Bull. Geol. Ins* . LTpaala 16:243 260, // pi. 1919. -Records Salvinia formo '* Heer from the 

 late Terl iary of Japan ami passes in critical review the various fossil i a the literature 



of paleobotany. -Ten are recognized from Btrata ranging in age from Eocene '■> I'll i • and 



covering North America, Europe and ^sia. S. • lliplica Ne \ berry is given as from the U] 

 ('ret a ceo. is of Washington State. It really comes from the Eocene Puget group. -E. W. Berry. 



1206. GoTHAN, W. Das Alter der Karbonformation nordlich der Roer und Allgemelnes 

 iiber Horizontierung im Karbon mit Hilfe der Flora. [The age of the coal deposits north of the 

 Roer, and generalizations concerning stratification in coal by means of the flora.] GlQckauf 

 55 Jahrg. No. 2G. 477-483. June 28, 1919. 



1207. Goth an, W. Uber elnen interessanten Pteridospermenfund. [Discovery of an 

 interesting Pteridosperm.] Zeitg. Dcutsch. Geol. Gesell. 71: 14. 1919. — Records a specimen 

 of Sphenopteris dicksonoides Goppert from the Carboniferous of Lower Silesia with seeds and 

 cupules of Lyginopteris type, and a specimen of Sphenopteris adiantoide* Schlothcim (elegans 

 of authors) with Telangium or Calymmotheca cupules or microsporangia. — E. W. Berry. 



1208. Gothan, W. On the Taeniopteris multinervia of Meister. Zeits. Deutsch. Geol. 

 Gesell. 71: 12-13. 1919. — Suggests that this form which the author thought was a Glossop- 

 tcris is really an Acrostichum and the deposits in which it was found are Tertiary in age 

 instead of Paleozoic. — E. W. Berry. 



1209. Goth an, W., and E. Zimmerman. Pflanzliche und tierische fossilien der deutschen 

 Braunkohlenlager. [Plant and animal fossils of the German brown coal deposits.] 54 p.. 41 

 fig. Halle (Saale). 1919. — A well illustrated popular account of the fossils found in and 

 associated with the brown coal deposits of Germany. Thirty pages and 24 figures are devoted 

 to the more interesting fossil plants that have contributed to the formation of the coal. The 

 remainder of the booklet is devoted to the shells, insects and vertebrates of the deposits. — 

 E. W. Beny. 



1210. Harder, E. C. Iron-depositing bacteria and their geologic relations. U. S. Geol. 

 Surv. Prof. Paper 113. 89 p. 14 fig-, 12 pi. 1919. — Presents the carefully digested results 

 of field and laboratory studies of springs, bogs, mine and stream waters by a geologist who 

 has had exceptional opportunities of studying the iron ore deposits of different parts of the 

 world and who has been especially interested in their mode of origin, especially the enormous 

 amounts of sedimentary ores, bog ores and surface concentrations, the origin of which has 

 usually been attributed to the inadequate processes of simple exidation and precipitation from 

 ferrous solutions; since about 90 per cent of the present iron production comes from these 

 sources the question of origin is one of great economic importance. It is of great interest to 

 the student of earth history and also to the students of plant evolution and history, since these 

 types of ores are common at all geological horizons and are especially prominent in the pre- 

 Cambrian as in the Lake Superior region, in Minas Geraes, Brazil, and in India. Biologists 

 are much interested in the bearing upon evolutionary problems of the possible occurrence in 

 early geologic times of bacteria and similar organisms. Mr. Harder concludes that there are 

 three principal groups of iron-depositing bacteria — (1) those that precipitate ferric hydroxide 

 from solutions of ferrous bicarbonate, using the carbon dioxide for metabolic energy; (2) 

 those that do not require ferrous bicarbonate for their vital processes but cause the deposition 

 of ferric hydroxide when either inorganic or organic salts are present; and (3) those that 

 attack iron salts of organic acids using the acid radicle and leaving the ferric hydroxide or 

 basic ferric salts. Not only are the higher so-called thread bacteria found to be widely dis- 

 tributed in nature but the author shows that many of the more primitive bacteria arc con- 

 cerned in the role of iron precipitation. — The paper, in addition to the new facts recorded, 

 constitutes a critical summary of previous work and a full bibliography. [See Bot. Absts. 4, 

 Entry 1106.]— £. W. Berry. 



