allusion to the use of moulds in certain passages from the Latin writers.[329] The final proceeding was the drying in the sun. An important branch of the subject is the use of terracotta for roof-tiles and other architectural decorations of temples and other buildings. On this point our knowledge has during the last five-and-twenty years been marvellously increased, the extent of its use in architecture having been hitherto but little suspected.[330] The generic term for a roof-tile is in Greek κέραμος; they are generally divided into flat tiles (στεγαστῆρες or σωλῆες, _tegulae_) and covering-tiles (καλυπῆρες, _imbrices_). Besides the ordinary roof-tiles there must also be taken into consideration four varieties of ornamental tiles which found their place on a classical building. They are: (1) the covering-slabs arranged in a row along the γεῖσον, or raking cornice of the pediment; (2) the κυμάτιον or cornice above the γεῖσον; (3) the cornice along the sides of the building, with spouts in the form of lions' heads, to carry off rain-water; (4) the row of antefixal ornaments or ἀκρωτήρια surmounting the side-tiles.[331] The flat roof-tiles or σωλῆες, as in the Heraion of Olympia and other early buildings, are square and slightly concave, so that the raised edges placed side by side may catch under the semi-cylindrical καλυπῆρες, and so be held in their place. The latter are of plain semi-cylindrical form, except the row at the lower edge of the roof, which have attached to them the vertical semi-elliptical slabs known as “antefixae,” of which more later. The κυμάτια were painted with elaborate patterns of lotos-and-honeysuckle, or maeanders, in red, blue, brown, and yellow, the principle being preserved (as always in Greek architectural decoration) of employing curvilinear patterns only on curved surfaces, rectilinear only on flat surfaces.[332] At the back was the gutter for collecting rain-water, which ran off through the holes pierced at intervals in the cornice, passing through the mouths of lions’ heads, moulded in very salient relief. These correspond to the gurgoyles of Gothic architecture. Many specimens have been found at Olympia, Elateia, and elsewhere in Greece; one of the finest, from a temple of Apollo at Metapontum, is now in the Bibliothèque Nationale at Paris. It is very finely modelled, and the whole, with the background, richly coloured in red, yellow, and black.[333] Spouts were sometimes modelled in other forms, such as a Satyric mask, or the fore-part of a lion; of the latter there are some examples in the British Museum.[334] In the accounts for the erection of the arsenal at the Peiraeus there is an interesting entry relating to these lions’ head spouts, in which they are described as κεραμίδες ἡγέμονες λεοντοκεφάλαι, “principal tiles with lions' heads.”[335]