828 PRINCIPLES OF STRATIGRAPHY 



22a. ULRICH, E. O. Revision of the Palaeozoic Systems. Bulletin of the 

 Geological Society of America, Vol. XXII, pp. 281-680. 



23. VAN HISE, CHARLES R. 1904. A Treatise on Metamorphism. United 



States Geological Survey, Monograph XLVII. 



24. WAGNER, GEORG. 1913. Stylohthen und Druck-suturen. Geolog- 



ische und Palaeontologische Abhandlungen (Koken), N. P., Band XI 

 (XV), Heft 2, pp. 101-127, taf. X-XII. (With literature.) 



25. WELLER, STUART. 1899. A PecuHar Devonian Deposit in North- 



eastern Illinois. Journal of Geology, Vol. VII, pp. 483-488. 



26. WOODWORTH, J. B. 1896. On the fracture system of joints, with 



remarks on certain great fractures. Boston Society of Natural History 

 Proceedings, Vol. XXVII, pp. 163-183, pis. 1-5. 



Supplementary . 



27. BOHM, A. (Edler von Bohmersheim) 1910. Abplattung und Gebirgs- 



bildung. Leipzig und Wien; p. 83. 



28. POKELS, F. 191 1. Aenderungen der Rotationsgeschwindigkeit der Erde 



als geologischer Faktor. Geologische Rundschau, Band II, pp. 141— 

 144. 



29. TAYLOR, F. B. 1885. On the Cmmpling of the Earth's Crust. American 



Journal of vScience. 3rd ser.. Vol. XXX, pp. 259-277. 



30. WILLIS, BAILEY. 1907. A Theory of Continental Structure Apphed 



to North America. Geological Society of America. Bulletin Vol. 

 XVIII, pp. 388-412. 



