For difficulties of savages in arithmetic, see Lubbock, as above, pp.

459 et seq.

For a very temperate and judicial view of the whole question, see Tylor as above, chaps.

vii and xiii.

For a brief summary of the scientific position regarding the stagnation and deterioration of races, resulting in the statement that such deterioration "in no way contradicts the theory that civilization itself is developed from low to high stages," see Tylor, Anthropology, chap.