e ran and picked him up with her finger and
thumb, put him and his plough and oxen into her apron, and carried them
to her mother, saying, "Mother, what sort of beetle is this that I have
found wriggling in the sand?" But the mother said, "Put it away, my
child; we must begone out of this land, for these people will dwell in
it."

M. Worsaae of Copenhagen, who has been followed by other antiquaries,
has even gone so far as to divide the natural history of civilization
into three epochs, according to the character of the tools used in
each. The first was the Stone period, in which the implements chiefly
used were sticks, bones, stones, and flints. The next was the Bronze
period, distinguished by the introduction and general use of a metal
composed of copper and tin, requiring a comparatively low degree of
temperature to smelt it, and render it capable of being fashioned into
weapons, tools, and implements; to make which, however, indicated a
great advance in experience, sagacity, and skill in the manipulation of
metals. With tools of bronze, to which considerable hardness could be
given, trees were felled, stones hewn, houses and ships built, and
agriculture practised with comparative facility. Last of all came the
Iron period, when the art of smelting and working that most difficult
but widely diffused of the minerals was discovered; from which point
the progress made in all the arts of life has been of the most
remarkable character.

Although Mr. Wright rejects this classification as empirical, because
the periods are not capable of being clearly defined, and all the three
kinds of implements are found to have been in use at or about the same
time,[2] there is, nevertheless, reason to believe that it is, on the
whole, well founded. It is doubtless true that implements of stone
continued in use long after those of bronze and iron had been invented,
arising most probably from the dearness and scarcity of articles of
metal; but when the art of smelting and working in iron and steel had
sufficiently advanced, the use of stone, and afterwards of bronze tools
and weapons, altogether ceased.

The views of M. Worsaae, and the other Continental antiquarians who
follow his classification, have indeed received remarkable confirmation
of late years, by the discoveries which have been made in the beds of
most of the Swiss lakes.[3] It appears that a subsidence took place in
the waters of the Lake of Zurich in the year 1854