space is twenty feet in diameter, the walls about fourteen feet thick at the base, and eight feet at the top. They contain a staircase, which leads to the top of the building. Similar structures are found in the Island of Sardinia.
In New Mexico and Colorado the remains of round-towers are very abundant. The illustration below represents one
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| round-tower of the cañon of the mancos, coloeado, u. s. |
of these in the valley of the Mancos, in the south-western corner of Colorado. A model of it is to be found in the Smithsonian collection at Washington. The tower stands at present, in its ruined condition, twenty feet high. It will be seen that it resembles the towers of Ireland, not only in its circular form but also in the fact that its door-way is situated at some distance from the ground.
It will not do to say that the resemblance between these prehistoric and singular towers, in countries so far apart as Sardinia, Ireland, Colorado, and India, is due to an accidental coincidence. It might as well be argued that the resemblance
