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In the interval left between
the two piles of each couple, a great beam was lodged, called the
_head-piece_, of two feet square; these two couples (_hæc utraque_) were
bound together on each side,           from the upper extremity, by two
wooden ties (_fibulæ_), so that they could neither draw from nor towards
each other, and presented, according to the “Commentaries,” a whole of a
solidity so great, that the force of the water, so far from injuring it,
bound all its parts tighter together.