213.]
[Footnote 29: Ondegardo, Rel. Seg., Ms. - Ulloa, Not. Amer., ent.
21.
Humboldt, who analyzed the cement of the ancient structures at
Cannar, says that it is a true mortar, formed of a mixture of
pebbles and a clayey marl. (Vues des Cordilleres, p. 116.)
Father Velasco is in raptures with an "almost imperceptible kind
of cement" made of lime and a bituminous substance resembling
glue, which incorporated with the stones so as to hold them
firmly together like one solid mass, yet left nothing visible to
the eye of the common observer. This glutinous composition,
mixed with pebbles, made a sort of Macadamized road much used by
the Incas, as hard and almost as smooth as marble. Hist. de
Quito, tom. I. pp. 126-128.]
The greatest simplicity is observed in the construction of the
buildings, which are usually free from outward ornament; though
in some the huge stones are shaped into a convex form with great
regularity, and adjusted with such nice precision to one another,
that it would be impossible, but for the flutings, to determine
the line of junction. In others, the stone is rough, as it was
taken from the quarry, in the most irregular forms, with the
edges nicely wrought and fitted to each other. There is no
appearance of columns or of arches; though there is some
contradiction as to the latter point. But it is not to be
doubted, that, although they may have made some approach to this
mode of construction by the greater or less inclination of the
walls, the Peruvian architects were wholly unacquainted with the
true principle of the circular arch reposing on its key-stone.
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