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[99] Sven Hedin, Central Asia and Tibet, Vol.

I, p.184.New York and London, 1903.
[100] John de Plano Carpini, Journey in 1246, p.130._Hakluyt Society_, London, 1904.
[101] Journey of William de Rubruquis in 1253, p.188.

_Hakluyt Society_, London, 1903.
[102] Volney, quoted in Malthus, Principles of Population, Chap.

VII, p.
60.

London, 1878.
[103] Genesis, Chap.