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Rh mixture of metals, copper and a small portion of tin melted together, to which the name of "bronze" has been given; from which circumstance the period in which this substance was commonly used has been named the bronze-period. Finally, all objects appertaining to the period when iron was generally known and employed, are included in the third class, and belong to the iron-period.

We will now consider these three classes, each by itself, and will commence naturally with the most ancient, the so called stone-period.

Denmark seems to have been raised by a powerful revolution of nature from the bosom of the sea. By degrees its naked banks of gravel became covered with aspen forests. When the land rose still higher and the dampness diminished, the aspen disappeared after having by numerous successive growths formed a way for the fir, which now spread all over the country. This species of tree continued for a very long period, but at length was compelled to give place to a very different and a higher class. At first the beech was unable to grow here. The earth was covered with oaks, of that species termed the winter oak, which differs from the now prevailing species, the summer oak; these were succeeded by groves of alders, until all was so prepared and developed that the light and beautiful beech spread its crowns over the whole country.

That Denmark in its primeval times, before it possessed its present vegetation, had passed through these four periods, is clearly proved from the ancient peat bogs, in which are found stems of trees of each distinct period lying like beds one over the other. As they are usually found lying in a prostrate position, many have supposed that the changes in vegetation have been caused by powerful and mighty phenomena in nature, such as storms and floods. This idea however is by no means