LIST OF PRINCIPAL BOOKS CONSULTED 
Andrews, C. W., " On the Evolution of the Proboscidea." 
Avebury, Lord, ''Prehistoric Times." 
Ball, Sir R., " The Earth's Beginning." 
Beddard, F. E., '' Mammalia," " Structure and Classification of Birds." 
Bonney, T. G., " The Story of Our Planet." 
Boulenger, G. A., and Bridge, T. W., " Fishes." (Cambridge Natural 
History.) 
Claus, C., " Text Book of Zoology," translated by Adam Sedgwick. 
Dana, J. D., " Manual of Geology." 
Darwin, C., " The Origin of Species," " The Descent of Man." 
Dawkins, W. Boyd, " Early Man in Britain," " Cave Hunting." 
Dawson, Sir J. W., " Acadian Geology," " The Geological History 
of Plants." 
Encyclopaedia Britannica ("Anthropology," "Geology," "Physiology," 
and other articles). 
Flower and Lydekker, " Mammals Living and Extinct." 
Gadow, H. " Amphibia and Reptiles." (Cambridge Natural History.) 
Geikie, Sir A., " Text Book of Geology." 
Geikie, J., " The Great Ice Age." 
Gunthner, A., " The Study of Fishes." 
Haeckel, E., " History of Creation," " The Last Link." 
Heer, Prof. " The Primeval World of Switzerland." 
Hutchinson, Henry N., " Extinct Monsters," " Creatures of Other Days," 
" The Autobiography of the Earth." 
Huxley, T. H., " Man's Place in Nature." 
Jukes-Browne, A. J., "The Building of the British Isles," "Strati- 
graphical Geology." 
Kayser, E., " Text Book of Comparative Geology," translated by 
Philip Lake, 
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