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disposed at equal intervals between them, against the centreof every tile. Those over the columns should be perforateddown to the channel which receives the rain water; and theothers solid, in order that the water which is received intothe gutters from the roof, having no means of escapingthrough them, may not incommode those who, in seekingshelter, are obliged to pass through the intervals betweenthe columns. The water is discharged from the mouths ofsuch heads only as are placed over the columns.

Having thus closed the relation of what appertains tothe construction of Ionic temples, we proceed in the nextbook to explain the proportions which are peculiar totemples of the Doric and Corinthian orders of architecture.

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