91 



[i8 9 9.] 



SOLLAS, W. J. 4. On the Occurrence of Sponge-spicules in the Carboniferous 

 Limestone of Derbyshire. Q. J. G. S. lv. pp. 716-717. 1899 ; Abs. Proc. Geol. 

 Soc. 1898-99, p. 83. 1899. 



5. Report of the Committee appointed to consider a Project for Investigating a 



Coral Reef by Boring and Sounding. Rep. Brit. Assoc. 1898, pp. 556-557. 1899. 



SOLMS-LAUBACH, H. Geap ztj. See Steinmanh, G. 



SOMERVAIL, A. On the Age and Origin of the Granite of Dartmoor, and its 

 Relations to the Adjoining Strata. Hep. Brit. Assoc. 1898, pp. 877-878. 1899. 



SOMMERFELDT, E. Ueber die Aenderung des Winkels der optischen Axen am 

 Lithiophilit mit der Temperatur. N. J.f. 3Iin. 1899, pp. 152-L54. 1899. 



SOPP, E. J. B. Submerged Forests near Hoylake. [Cheshire.] Sci.- Gossip, n. s., 

 vi. pp. 81-83, tigs. 1899. 



SOP WITH, G. See Obit., Whitaker, W. 



SOREIL, G. Manifestation en l'Honneur de M. G. Dewalque. Ann. Soc. geol. 



Belg., Liege, xxvi. pp. cxxiii-cxxvii. 1899. 



■ 2. Adolphe de Vaux. [Obit.] Ibid. pp. cxlii-cxliv. 1899. 



3. Relations entre les Bassins Houillers Beiges et Allemands. Ibid. pp. 111- 



113. 1899. 



SOULEYRE, A. Origine et Distribution des Gites de Metalloides. Ilessources 

 minieres du Sahara. Rev. Sci., Baris, ser. 4, xi. pp. 269-275. 1899. 



SOUTHWOOD, R. T. Tuli Coalfield, Matabeleland. Rep. Brit. 8. Africa Co. 

 1897-98, pp. 199-200, 1 pi. [Map, 1 inch = 1 mile.] 1899. 



SPENCER, J. The Yoredale and Millstone-Grit Rocks of the Upper Calder Valley, 

 and their Fossils. Broc. Tories. Geol. Soc. n. s. xiii. pp. 375-394, pi. lix. 1899. 



. See Obit., Law, R. 



SPENCER, J. W. Great Changes of Level in Mexico and the Interoceanic 



Connections. Bull. Geol. Soc. Am. ix. pp. 13-34, pis. i-v. [Map.] 1898. 

 2. Prof. Hull's ' Submerged Platform of Western Europe.' Geol. Mag. 



dec. 4, vi. pp. 16-18. 1899. 



3. Mr. Hudleston ' On the Eastern Margin of the North Atlantic Basin.' 



' Ibid. pp. 559-566. 1899. 

 SPENCER. L. J. Leadhillite in Ancient Lead-Slags from the Mendip Hills. 



Geol. Mag. dec. 4, vi. pp. 71-72. 1899 ; Rep. Brit. Assoc. 1898, p. 875. 1899. 

 2. Supplementary List of British Minerals. Ibid. pp. 875-877. 1899 ; Geol. 



Mag. dec. 4, vi. pp. 75-77. 1899. 

 3. Plagionite, Heteromorphite, and Semseyite as Members of a Natural Group 



of Minerals. With Analyses by G. T. Prior. Min. Mag. xii. pp. 55-68. 



1899. 



. See Peioe, G. T. 



SPENDIAROV, L. Ueber einige Seeigel aus dem Jura des Kaukasus. [Coll yrites.] 



Beitr. Baldont. Oesterr.-TInq. xi. pp. 199-206, figs. 1898. 

 SPENS, W. Geological Section Report, 1898. Rep. Rugby School Nat. Hist. Soc. 



1898, pp. 82-81. 1899. 

 SPEZIA, G. Contribuzioni di Geologia chimica. Esperienze sul Quarzo e sull' 



Opale. Rev. Min. e Crist, ital. Badova, xxi. pp.. 36-42. 1898. 



2. . Esperienze sul Quarzo. Ibid. pp. 49-68. 1899. 



3. Sopra un Deposito di Quarzo e di Silice gelatinosa trovato nel Traforo del 



Sempione. [Simplon.] Atti R. Acc. Sci. Torino, xxxiv. pp. 705-713. 1899. 

 4. Sul Colore del Zircone. Ibid. pp. 906-910. 1899. 



SPRING, W. Sur l'Origme de la Fissilite des Phyllades et des Schistes. Bull. 



Acad. Roy. Belg. ser. 3, xxxv. pp. 31-34. 1898/ 

 2. Sur les Matieres colorantes, a Base de Fer, des Terrains de Sediment et sur 



l'Origine probable des Roches Rouges. Ibid. pp. 521-545. 1898. 

 3. Sur la Cause de 1' Absence de Coloration de certaines Eaux limpides Naturelles. 



Ibid, xxxvi. pp. 266-276. 1898. 

 4. Ueber die eisenhaltigen Farbstoffe sedimentarer Erdboden und fiber den 



wahrscheinlichen Ursprung der Rothen Felsen. N. J. f. Min. 1899, i. pp. 47-62. 



1899. 



5. Ueber die Ursache der Farblosigkeit gewisser klarer naturlicher Gewasser. 



Ibid. ii. pp. 47-54. 1899. 

 6. Ueber den einheitlichen Ursprung der blauen Wasserfarbe. Ibid. pp. 99- 



104. 1899. 



SPRINGER, F. Notice of a new Discovery concerning TTintacrinus. Am. Geol. 



xxiv. p. 92. 1899. 

 . See Bathee, F. 



SPURR, J. E. Geology of the Aspen Mining District, Colorado. With Introduction 

 by S. F. Emmons. Monogr. TJ. S. Geol. Surv. xxxi. pp. i-xxxv, 1-200, pis. i-xliii. 

 1898 ; and Atlas (Fol.) sheets 1-30. [Maps, ^L. & _!..] 1898. 



