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Updated: May 29, 2025
By this their doctors are guided in the performance of acupuncture, marking the safe places to thrust in needles, as we buoy out our ship-channels, and doubtless indicating to learned eyes the spots where incautious meddling had led to those little accidents of shipwreck to which patients are unfortunately liable. A change of method, then, has given us General and Regional Anatomy.
In groups of atolls, exposed to a trade-wind, the ship-channels into the lagoons are almost invariably situated on the leeward or less exposed side of the reef, and the reef itself is sometimes either wanting there, or is submerged.
"But it would not be so, if I could get hold of an oar of the government," he added with a laugh, as he held the boat steady with his own oar while his passengers landed. The little steamer was just drawing up to the pier from its trip across the lagoon. This lagoon is a wide stretch of water, deep only in those places where the ship-channels are kept constantly dredged.
In the many small atolls without any channel, these causes have not prevented the entire ring attaining the surface. Passages between the islets on the reef, through which boats can pass at high water, must not be confounded with ship-channels, by which the annular reef itself is breached.
But as matter is accumulated only on the backward part of the reef, the front part would remain of the same height on both sides. It is likewise owing to this same cause, that reefs are more frequently breached to leeward by narrow channels, serving as by ship-channels, than to windward.
Four miles to seaward is the mouth of the harbor, and nearly midway therein stood the more extensive and imposing work of Fort Sumter, its guns not only sweeping all the approaches and ship-channels, but the shores and islands on either hand. It needs but a glance at the map to see that with proper garrisons and armaments Fort Sumter commanded the harbor. and Castle Pinckney commanded the city.
The great arm of the sea thus included, is from ten to twenty-five fathoms deep, with a sandy bottom; but towards the southern end, where the reef is further from the shore, the depth gradually increases to forty, and in some parts to more than sixty fathoms. The outer edge is the highest part; it is traversed by narrow gullies, and at rare intervals is breached by ship-channels.
There, midway in the narrow strait, is the black, bare rock of Perim, sterile, precipitous, a perfect counterpart of Gibraltar; and on either side, between it and the main-land, are the ship-channels which connect the Red Sea with the great Indian Ocean. This England seized in 1857.
By this their doctors are guided in the performance of acupuncture, marking the safe places to thrust in needles, as we buoy out our ship-channels, and doubtless indicating to learned eyes the spots where incautious meddling had led to those little accidents of shipwreck to which patients are unfortunately liable. A change of method, then, has given us General and Regional Anatomy.
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