[i8 9 8.] 



100 



WACHSMUTH, C. See Bather, F. A. 



WADSWORTH, M. E. Some Methods of Determining the Positive or Negative 

 Characters of Mineral Plates in Converging Polarized Light with the Photo- 

 graphical Microscope. Am. Geol. xxi. pp. 170-175. 1898. And A.C. 



■ 2. Zirk elite — a Question of Priority. Journ. Geol. Chicago, xi. pp. 199-200. 



1898. And A.C. 



3. Zirkelit, eine Prioritatsfrage. A T . J.f. Min. 1898, i. p. 164 1898. 



4. The Origin and Mode of Occurrence of the Lake Superior Copper-Deposits. 



Trans. Am. Inst. M. JE. xxvii. pp. 669-696. 1898. And A.C. 



■ 5. The Michigan College of Mines. Ibid. pp. 696-711. 1898. And A.C. 



WAGNER, G. On some Turtle Remains from the Fort Pierre. Kansas Univ. 



Quart, vii. ser. A, pp. 201-203, figs. 1898. 

 WAGNER, R. Beitrag zur genaueren Kenntniss des Muschelkalks bei Jena. Abk. 



Jc.-preuss. geol. Landesanst. n. s., no. 27, pp. 1-106, figs., pis. i & ii. 1897. 

 WAHNSCHAFFE, F. Der dritte Lehrgang fur landwirthschaftliche Wander- 



lehrer zu Eisenach vom 18. bis 23. April 1898 in seinen Beziehungen zur prak- 



tischen Geologie. Zeitschr.f. praJct. Geol. 1898, pp. 186-196. 1898. 

 2. Die Entwicklung der Glacialgeologie im norddeutschen Flachlande. Ibid. 



pp. 409-411. 1898. 



WALCOTT, C. D. Cambrian Brachiopoda : Genera Iphidea and Torkia, with 

 Descriptions of New Species of each and of the Genus Acrothele. Proc. U.S. 

 Nat. Mus. xix. pp. 707-718, pis. lix & lx. 1897. 



2. Note on the Brachiopod Fauna of the Quartzitic Pebbles of the Carboni- 

 ferous Conglomerates of the Narragansett Basin, Rhode Island, Am. Journ. Sci. 

 ser. 4, vi. pp. 327-328. 1898. 



■ 3. Fossil Medusa?. Monogr. U.S. Geol. Surv. xxx. pp. 1-201, figs., pis. i-xlvii. 



1898. 



(Director). Report of the Director. Ann. Rep. U.S. Geol. Surv. xvii. pt. 1, 



pp. 5-200. [1 Map.] 1896. 

 ( ), &c. United States Geological Survey. Geologic Atlas. (except 



when otherwise stated). Fol. Washington. 



26. Pocahontas (Va.) & W. Va., by M. R. Campbell. 1896. 



27. Morristown (Tenn.), by A. Keith. 1896. 



28. Piedmont (W. Va.) & Md., by B. Willis, N. H. Darton, & J. A. 



Taef. 1896. 



29. Nevada City (Cal.), by W. Lindgeen. 1896. 



30. Yellowstone National Park (Wy.), by A. .Hague ; Igneous Rocks, by 



J. P. Iddings. 2 pis. Views. 1896. 



31. Pyramid Peak (Cal.), by W. Lindgee^. 1896. 



32. Franklin (W. Va.), by N. EL Daeton. 1896. 



33. Briceville (Tenn.), by A. Keith. 1896. 



34. Buchanan (W. Va.), by J. A. Taef & A. H. Brooks. 1896. 



35. Garsden (Ala.), by C. W. Hates. 1896. 



36. Pueblo (Colo.), by G. K. Gilbeet. 1897. 



37. Downieville (Cal.), by H. W. Turneb. 1897. 



WALCOTT, R. H. The Occurrence of so-called Obsidian Bombs in Australia. 

 Proc. Poy. Soc. Victoria (Austr.) xi. pp. 23-53, pis. iii & iv. 1898. 



WALKER, G. B. Supplementary Notes to Mr. R. Gascoyne's Paper on the 'Coal- 

 fields of Chili.' Trans. Fed. Inst. 31. P. xv. pp. 244-249. 1898. [See 

 Gascotne, R.] 



WALKER, T. L. Percussion Figures on Micas. Pec. Geol. Surv. India, xxx. 



pp. 250 & 251, fig. 1897. 

 2. Examination of some Triclinic Minerals by means of etching Figures. Am. 



Journ. Sci. ser. 4, v. pp. 176-185, figs. 1898. 



3. The Crystalline Symmetry of Torbernite. Ibid. vi. pp. 41-44. 1898. 



■ 4. Causes of Variation in the Composition of Igneous Rocks. Ibid. 



pp. 410-415, figs. 1898. 

 WALLACE, J. See Prinsep, H. C. 



WALLERANT, F. Determination des Indices de Refraction des Mineraux des 



Roches. Bull. Soc. franc. Min. xx. pp. 234-257. 1897. 



. 2. Memoire sur la Fluorine. Ibid. xxi. pp. 44-85, figs., pi. i. 1898. 



■ 3. Sur le Polymorphisrne de la Fluorine. C. P. Acad. Sci. Paris, cxxvi. 



p. 494. 1898. 



4. Sur les Anomalies optiques et le Polymorphisrne. Ibid. pp. 664-666. 



1898. 



5. Sur le Polymorphisrne. Ibid. pp. 1586-1588. 1898. 



6. Sur une Loi nouvelle relative aux Groupements des Cristaux. Ibid, cxxvii. 



pp. 1250-1252. 1898. 



