412 SUPPLEMENT FOR 1874. 



Schmidt, Dr. C. Hydrologische Untersucliungen. Bull. Soc. Imp, 

 Sci. St. Petersbourg, t. xx. pp. 130-169. 



Analyses by the author, Dr. J. Grimm, and others (some quoted) of 

 waters and mud from the Aral, Caspian, White, Dead, and Frozen Seas, 

 and several rivers and lakes. W. H. D. 



Schmidt, F. Miscellanea Silurica. II. Ueber neue und wenig 

 bekannte baltisch-silurische Petrefacten. [New and little -known 

 Fossils from the Baltic Silurian.] Mem. Ac. Imp. Sci. St. Peters- 

 bourg, ser. vii. t. xxi. no. 11, pp. 48, pis. i.-iv. 

 Describes amongst others the following new species : — Asteroblastus 

 tuber culat as, A. Volborthii, Bothriocidaris Pahleni, Glyptocystites 

 sculptus, G. Volborthii, and Tetraclium (n. gen.) Wrangeli. W. H. D. 



Seidlitz, Dr. C. v. Das General-Nivellement Esthlands. [General 

 Levelling, Esthonia.] Sitz. nat. Ges. Dorpat, Bd. iii. pp. 359-379. 

 A few geological notes. 



Selwyn, A. R. C. Notes on a Journey through the North West 

 Territory, from Manitoba to Rocky Mountain House. Canacl. Nat. 

 n. 8. vol. vii. pp. 193-216, &c. 



The hills are covered with Drift and Erratic blocks of various rocks. 

 Silurian Limestone boulders occur on the 1st and 2nd prairie steppes. 

 At Rocky Mountain House the boulders are chiefly Coal Measure sand- 

 stone and ? Potsdam quartzite. Ascending the Saskatchewan the 

 metamorphic rocks and gold disappear. Tertiary and Cretaceous silicified 

 wood occurs n6ar here, and 86 miles from Rocky Mt. House is a seam 

 of coal 18-20 feet thick. Below Victoria are flagstone, limestone, and 

 septarian clay ; at Cedar Lake Silurian limestone appears, and Devonian 

 limestone on L. W^innipegosis and Manitoba. R. B. N. 



Siewert, Dr. C. Ueber einige Mineralwasser und Heilquellen der 

 Argentinischen Republik. [Some Mineral Springs of the Argentine 

 Republic] La Plata Monat3schrift, no. 11, pp. 161-167, no. 12, 

 pp. 177-178 ; and Zeitsch. gesammt. Nat. Bd. x. pp. 481-501. 



Skene, A. J., and R. B. Smyth. Report on the Physical Character 

 and Resources of Gippsland. Ed. 2. Pp. 67. 8vo. Melbourne. 

 (For notice of Ed. 1, see Geological Recokd for 1874, p. 155.) 



Spiess, F. Physikalische Topographic von Thiiringen. [Physical 



Topography of Thuringia.] Pp. 144, 2 maps. Weimar. 

 Part iv. deals with the geology of the country and the adjoining regions 

 as far as the Hartz and the Rhone. 



Stoppani, Prof. A. II mare glaciale a piedi delle Alpi. [Glacial 

 Sea at the Foot of the Alps.] Rivista Italiana. 



Struckmann, Amstrath C. Geognostiche Skizze der Umgegend von 

 Hannover. [Geological Sketch of the Neighbourhood of Hanover.] 

 Pp. 26, with geological map after H. Credner. Hanover. A re- 



