R. M. Deeley—Plasticity of Rocks. 501 
LIST OF WORKS REFERRED TO. 
Darwin, C. 1851. A Monograph on the Fossil Lepadide or Pedunculated 
Cirripedes of Great Britain: Paleontographical Society, London, pp. vi, 88, 
with 5 pls. 
Darwin, C. 1854. A Monograph on the Sub-class Cirripedia, the Balanide, 
Synopsis et Index Systematicus: Ray Soc., London, pp. 684, with 30 pls. 
Downes, W. 1880. ‘‘ Blackdown’: Rep. and Trans. Devon. Assoc., Xii, 
pp- 420-46. 
Downes, W. 1882. ‘The Zones of the Blackdown Beds and their Correlation 
with those at Haldon, with a List of the Fossils’’: Quart. Journ. Geol. Soc. 
London, xxxvilil, pp. 75-92. 
Fritscu, A.J. & Karka, J. 1887. Die Orustaceen der Bohmischen Kreideformation. 
Prag. 4to; pp. 53, 10 pls. col., text-illust. 
Gemnitz, H. B. 1849-50. Das Quadersandsteingebirge, oder Kreidegebirge im 
Deutschland. Freiburg. 8vo; pp. 1-96, pls. i-vi, 1849; pp. 97-292, 
pls. vii-xii, 1850. 
Karka, J. 1886. ‘ Péispévek ku poznani cirripedt éeského Otvaru kridového”’ : 
Sitz. Ber. k. Bohm. Ges. Wiss., Prag, 1885, pp. 554-81, pls. i-il. 
Reuss, A. 1845-6. Die Versteinerungen der Bohmischen Kreideformation. 
Stuttgart. 4to; Abth. i, pp. 1-58, pls. i-xiii, 1845; Abth. ii, pp. 1-140, 
pls. xiv-l, 1846. 
Rormer, F. A. 1840-1. Die Versteinerungen des Norddeutschen Kreidegebirges. 
Hannover. 4to; 1 Lief., pp. 48, pls. i-vii, 1840 ; 2 Lief., pp. 97, pls. vili-xvi, 
1841. : 
Satter, J. W. & Woopwarp, H. 1865. A Descriptive Catalogue of all the 
Genera and Species contained in the accompanying Chart of Fossil Crustacea, 
showing the range in time of the several Orders, with some recent types. 
London. 4to; pp. ii, 28, with pl. 
Sowerpy, J. de C. 1836. ‘‘Descriptive Notes respecting the Shells figured in 
Plates XI-XXIII”’ (pp. 835-48). Appendix Ato W. H. Fitton, ‘‘ Observations 
on some of the Strata between the Chalk and the Oxford Oolite in the South-East 
of England’’: Trans. Geol. Soc. London, ser. 11, iv, pp. 103-389, pls. xi—xxiil. 
Srrenstrup, J. 1837. ‘‘Om Forwerdenens Dyrarter af de tvende Familier 
Anatiferide (Gray) og Pollicipedide (Gray) ’’: Kroyer, Naturhistorisk Tidsskrift, 
i, pp. 858-66. 
Srzenstrup, J. 1839. ‘‘ Bidrag til Cirripedernes Historie i Fortid og Nutid.’’ 
Ferste Bidrag. Anatiferide og Pollicipedide fra Kridtperioden: Kroyer, 
Naturhistorisk Tidsskrift, ii, pp. 396-415, pl. v. 
Woopwarp, H. 1877. British Museum Catalogue of British Fossil Crustacea, 
with their Synonyms and the Range in Time of each Genus and Order. London. 
8yo; pp. x1, 155. 
V.—Tue Prasticiry ofr Rocks any Mountain Bouinpine. 
By R. M. Dzstry, M.Inst.C.E., F.G.S. 
RITISH geologists must have read Professor Coleman’s Address 
to the Geological Section of the British Association with great 
pleasure and interest. As Professor Coleman remarks, geology finds 
some of its most seductive problems in the neglected extremes of the 
earth’s history. Out of the apparent tangle of the ‘drifts’ and 
Archean Gneisses Canadian geologists are now evolving an orderly 
sequence which must exercise considerable influence upon the progress 
of geology in other lands. The seemingly unnatural conjunction of 
Pleistocene and Archzean, Professor Coleman states, has furnished the 
clue to certain puzzling problems of the Archean. 
During a trip from Regina to Winnipeg this summer I had the 
pleasure of riding at the end of a Canadian Northern train with 
a young railway engineer, and discussing with him the problems that 
