220 PETROLOGY. 



Riviere, A. Note sur des apparences de formation sedimentaires 

 que preseutent lea roches granitiques employees au dallage des 

 trottoirs de Paris. [Sedimentary Appearances in Granitic Rocks.] 

 Compt. Rend. t. Ixxx. pp. 1448, ] 449. 



These appearances do not invalidate the theory of the igneous origin 

 of these rocks. 



. Sur les epoques d'apparition du porphyre quartzifere, de 



I'eurite serpentineuse et de leurs roches dependantes et accidentel- 

 les. [The dates of appearance of quartziferous porphyry, ser- 

 pentinous eurite, and their associated rocks.] Compt. Bend. t. 

 Ixxxi. p. 38. (Short abstract.) 



Rosenbusch, H. [Vitreous Basalt.] N. Jahrh. Heft viii. p. 855. 



Calls attention to the resemblance between the Pinnland substances, 

 called Sordawalite and Wichtisite, and the vitreous variety of basalt 

 known as Hyalomelane. F. W. E, 



Rudler, F. W. Basalt. Sci. Gos. no. 128, p. 188. 



An answer to Mr. H. P. Malet. 



Rutot, A. Note sur la formation des concretions appele'es gres 

 fistuleux et Tubulations sableuses contenues dans I'etage bruxel- 

 lien des environs de Bruxelles. [Formation of Concretions in the 

 Bruxellian near Brussels.] Ann. Soc. Geol. Belg. t. ii. Memoires, 

 p. 6-11. 



Shows that the fistulous grit concretions are due to the sponge 

 Stelletadiscoidea, and the sandy tubules to Dysidea? tuhulata. 



Sacher, E. Ueber das Erstarren geschmolzener Kugeln in einem 

 fliissigen Medium. [On solidification of molten balls in a fluid 

 medium.] Verh. h.-h. geol. Beichs. pp. 260-264. 

 Relates experiments on parafiin allowed to solidify between warm 

 and cold layers of spirit — supposed to be analogous to the solidification 

 of cosmical bodies. E. B. T. 



Scheurer-Kestner, M. A., and C. Meunier-DoUfus. [Calorimetric 

 Trials and Analyses of Coals and Lignites.] Bidl. Soc. Indus^t. 

 Mulhouse., June. (Abstract in Proc. Inst. Civ. Eng. vol. xliii. 

 p. 289.) 

 12 samples of coals (2 English) and 7 samples of lignite were tried. 

 Details of analyses and results are given. 



. Schlsesing, T. Determination de I'argile dans la terre arable. 

 [Determination of Clay in Arable Lands.] Compt. Bend. t. 

 Ixxviii. pp. 1276-1279. 

 Detailed description of a new method of soil analysis. 



Schondorff, Dr. A. Koksausbeute und Backfahigkeit der Steinkohlen 

 des Saarbeckens. [The Coking Properties and Yield of the Coals of 

 the Saar Basin.] Zeitsch. Berg- Hutt. Scdinenw. Bd. xxiii. pp. 135- 

 162. 



Contains the results of 282 experiments upon the coking qualities of 

 the Saarbriicken coals. Finds that in these generally the amount of 



