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On observing the living Podura, the mouth seems a simple ring, with a minute labrum and groups of hairs and spinules, which the observer, partly by guess-work, can identify as jaws and maxillæ, and labium. But in studying the parts rendered transparent, we can identify the different appendages. The labrum, or upper lip, is separated by a deep suture from the clypeus, and is trapezoidal in form.
They were all built after the model of those which served for the casting of the Rodman gun; they were trapezoidal in shape, with a high elliptical arch. These furnaces, constructed of fireproof brick, were especially adapted for burning pit coal, with a flat bottom upon which the iron bars were laid.
The motive of various military camps may perhaps be found rather in a wish to secure the same area as that of an orthodox rectangle, even though the ground forbade the strict execution of the orthodox figure. Whatever the reason, the trapezoidal house-blocks of Pompeii exhibit a feature which is not alien to the earlier town-planning of Italy, though it is strange to the cities of Greece. Norba.
At present we cannot trace these stages. Another fact claims notice. The town-planning of Pompeii is in the main trapezoidal, not rectangular. Neither its oblongs, nor its squares, nor its street-crossings exhibit true right angles, though many of the rooms and peristyles in the private houses are regular enough.
The system of the mountains of Parime separates the plains of the Lower Orinoco from those of the Rio Negro and the Amazon; it occupies a territory of trapezoidal form, comprehended between the parallels of 3 and 8 degrees, and the meridians of 61 and 70 1/2 degrees.
There is no other danger in entering the harbour than the reefs of Punta Brava, opposite which a battery of eight guns has been erected. Towards the west and south-west we see the fort, which is a regular pentagon with five bastions, the battery of the reef, and the fortifications that surround the ancient town, founded on an island of a trapezoidal form.
We arrived after a while at Valencia, a scattered hamlet in the woods, with a good shop or 'store' upon a village green, under the verandah whereof lay, side by side with bottled ale and biscuit tins, bags of Carapo nuts; trapezoidal brown nuts enclosed originally in a round fruit which ought some day to form a valuable article of export.
Which two rivers, as the reader may observe, form here a rectangular or trapezoidal space, ever widening as we go southward.
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