ADDENDA. 395 



with quartz and flakes of the micaceous mineral. Analyses are given 

 in duplicate of one pseudomoi'ph, chiefly micaceous, and of another with 

 70-5 p. c. of stannic oxide. F. W. R. 



Pomel, — . II n'y a point eu de mer interieure au Sahara. [There 



has been no Saharan Inland Sea.] Compt. Bdtid. t. Ixxx. pp. 1342, 



1343 ; and Bull. Soc. Geol. France, ser. 3, t. iii. p. 495. 



Reasserts his belief that the proposed Saharan sea is an impossible 



project. Claims to have first shown by indirect evidence that the 



Isthmus of Gabes is solid rock, as proved by M. Puchs. The recent 



levelling proves the discontinuity of the depression of the "Chotts" 



below the sea-level, and thus shows the impossibilty either of the 



Gabes sea or of the former great Saharan sea. G. A. L. 



Potier, — . Sur le Terrain de Transport. [Drift (of ^. France).] 

 Compt. Rend. Assoc. Fran^. 3 Sess. pp. 376, 377. (Abstract.) 



. Failles de I'Artois. [Faults in Artois.] Unci. pp. 377, 378. 



Abstract ; the faults in the Cretaceous and Tertiary are continuous 

 with pre-Triassic faults in the Coal Measures. 



. Transgressivite du Terrain Houiller sur le Calcaire Car- 



bouifere. [Overlap of Coal Measures on Carboniferous Lime- 

 stone (in N. France).] Compt. Mend. Assoc. Fran<^. 3 Sess. 

 pp. 378-380. 



Ramsay, Prof. A. C. The Pre-Miocene Alps and their subsequent 

 Waste and Degradation. Froc. Roy. Inst. vol. vii. pp. 455-457. 



The thicknesses of the subdivisions of the Miocene estimated, and 

 an average struck for the country between Geneva and Constance. An 

 account is given of the methods by which an approximate estimate was 

 made. The conclusion is that in pre-Miocene times the Alps must 

 have been higher than now, even though since that time they may 

 have been heaved up 5500 feet. R. B. N. 



Rath, Prof. G. vom. Aus einem Briefe. [Notes from Journal.] 



Bull. Soc. Imp. Nat. Mosc. t. xlix. pp. 141-144. 

 Journey in Austria and Germany. 



Richards, Prof. R. H. On a newly-discovered Lead Vein in New- 

 buryport, Mass. Proc. Boston Soc. Nat. Hist. vol. xvii. pp. 200-204. 



Rohson, H. R. Introductory Address. Institution of Engineers and 

 Shiphuilders in Scotkmd, vol. xix. pp. 1-25, pis. i., ii. 



Describes the Sub-Wealden boring (p. 6), and gives a detailed section 

 of the second boring (plates 1 and 2) to 1824 feet, on the scale of 

 35 feet to an inch. Works for water-supply in various parts of 

 Scotland are noticed, pp. 9-17. W. T. 



Routledge, Wm. Notes on the Sydney Coal-field in the Island of 

 Cape Breton, Jiritish North America. Travis. N. Engl. Inst. Eng. 

 vol. xxiv. pp. 191-216, pis. xxxv., xxxvi. (map, &c.) 



The district is divided into four '' basins " — the Sydney Mines, Lingan, 

 Glace Bay, and Block House. Sections and full details respecting these 



