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2The ribs having been fixed, Greek reeds, previously bruised, are tied to them, in the required form, with cords made of the Spanish broom. On the upper side of the arch a composition of lime and sand is to be laid, so that if any water fall from the floor above or from the roof, it may not penetrate. If there be no supply of Greek reeds, the common slender marsh-reeds may be substituted, tied together with string in bundles of appropriate length, but of equal thickness, taking care that the distance from one ligature to another be not more than two feet. These are bound with cord to the ribs, as above directed, and made fast with wooden pins. All the remaining work is to be performed as above described.
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