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The males of many birds are among the most beautiful objects in nature; but that the beauty of nature is altogether irrelative to man's admiration or appreciation, is strikingly proved by the admirable sculpture on Diatoms and Foraminifera; beings whose very existence was unknown prior to the invention of the microscope.
Clodd tells us that one cubic inch of rotten stone contains 41 thousand million vegetable skeletons of diatoms. I cut the following from a London morning paper: It was discovered some few years ago that a peculiar bacillus was present in all persons suffering from typhoid, and in all foods and drinks which spread the disease.
Along the ventral side of the branchial sac runs a ciliated groove the hypobranchial groove which we have previously found at the same spot in the Amphioxus. The food of the Ascidia also consists of tiny organisms, infusoria, diatoms, parts of decomposed marine plants and animals; etc.
Thus, in the whole of the "intermediate zone," the silicious deposit which is being formed there, as elsewhere, by the accumulation of sponge- spicula, Radiolaria, and Diatoms, is obscured and overpowered by the immensely greater amount of calcareous sediment, which arises from the aggregation of the skeletons of dead Foraminifera.
Rocks are also often formed of whole fossils, or stones, or shells, bound into one by some natural soft sticky cement, which has gathered round them and afterwards grown hard, like the cement which holds together the stones in a wall. There are also some very minute forms of vegetable life, which exist in equally vast numbers, called Diatoms.
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