The observations of Spruce are of themselves almost conclusive as to the possibility of Europeans becoming acclimatized in the tropics; and if it is objected that this evidence applies only to the dark-haired southern races, we are fortunately able to point to facts, almost equally well authenticate
The best-known series is the papal series of leaden seals which have lent their name to the documents of the papal chancery which they authenticate, popularly known as papal bulls.
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