NO. 12 CHARLES DOOLITTLE WALCOTT 37 



1925. La discordance de stratification et le lacune stratigraphique Pre-Devoni- 

 enne dans les Provinces Cordilleres d'Alberta et de Colombie Britanni- 

 que, Canada. Livre Jubilaire, Cinquantenaire fondation See. Geol.. 

 Belgique, 1925, pp. 1 19-123, i text fig., 3 pis. 



1925. Joseph Henry. Science, Vol. LXII, No. 1610, Nov. 6, 1925, pp. 405-408. 



1925, Cambrian and Ozarkian Trilobites. Smithsonian Misc. Coll., Vol. 75, 

 No. 3. Cambrian Geology and Paleont., V, No. 3, June i, 1925, 

 pp. 61-146, pis. 15-24. 



1925. John Mason Clarke. Science, Vol. LXII, No. 1616, Dec. 18, 1925, p. 558. 



1925. Geological explorations in the Canadian Rockies, in Explorations and 



field-work of the Smithsonian Institution in 1924. Smithsonian Misc. 

 Coll., Vol. 77, No. 2, pp. 1-14, figs. 1-21. 



1926. Report of the Secretary of the Smithsonian Institution, Charles D. 



Walcott, for the year ending June 30, 1925. Ann. Rep. Smithsonian 

 Inst. 1925, 1926, pp. 1-27, with appendices. 

 1926. Samuel Pierpont Langley and modern aviation. Proc. Amer. Philos. Soc, 

 Vol. LXV, No. 2, 1926, pp. 79-82. 



1926. Geological explorations in the Canadian Rockies, in Explorations and 



field-work of the Smithsonian Institution in 1925. Smithsonian Misc. 

 Coll., Vol. 78, No. I, 1926, pp. 1-9, figs. I- 13. 



1927, Report of the Secretary of the Smithsonian Institution, Charles D. 



Walcott, for the year ending June 30, 1926. Ann. Rep. Smithsonian 

 Inst. 1926, 1927, pp. 1-33, with appendices. 



1927. Pre-Devonian sedimentation in southern Canadian Rocky Mountains. 



Smithsonian Misc. Coll., Vol. 75, No. 4. Cambrian Geology and 

 Paleont., V, No. 4, Apr. 2, 1927 (published posthumously), pp. 147-173, 

 pi. 25, figs. 14-23. 



1928. Pre-Devonian Paleozoic Formations of the Cordilleran Provinces of 



Canada. Smithsonian Misc. Coll., Vol. 75, No. 5, Cambrian Geology 

 • and Paleont., V, No. 5 (end of vol.). In press, April, 1928 (published 

 posthumously), pp. (estimated) 174-374, pis. 26-108, figs. 24-36. 



