The city was laid out as a gridiron of parallel streets, each of which had an attendant subterranean canal.
Barbacoa), originally a framework on posts placed over a fire on which to dry or smoke meat; hence, a gridiron for roasting whole animals, and in Cuba an upper floor on which fruit or grain is stored.
As they pass away southwards this gridiron formation strikes with a gentle curve westwards, the narrow enclosed valleys widening out towards the sources of the rivers, where ages of denudation have worn down the folds and filled up the hollows with fruitful soil, until at last they touch the central waterdivide, the key of the whole system, on the Quetta plateau.
Of the reptiles the leopard lizard and gridiron-tailed lizard, the " chuck-walla " (Sauromalus ater), the rattle-snake, and the horned toad are the most numerous.
Railways gridiron the province, which contains over one-third the total mileage of the dominion; their construction is aided by provincial and municipal subsidies, in addition to that paid by the federal government.