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Until lately, my reasons for considering the Pampaean formation to be an estuary deposit were, its general appearance, its position at the mouth of the existing great river the Plata, and the presence of so many bones of terrestrial quadrupeds: but now Professor Ehrenberg has had the kindness to examine for me a little of the red earth, taken from low down in the deposit, close to the skeletons of the mastodon, and he finds in it many infusoria, partly salt-water and partly fresh-water forms, with the latter rather preponderating; and therefore, as he remarks, the water must have been brackish.
Weldon that the land ought to be in sight, as it was on that piece of paper! And, meanwhile, on that white page, the "Pilgrim" drawn on an exact scale, would be smaller than the most microscopic of infusoria! That mathematical point, without appreciable dimensions, would appear lost, as it was in reality in the immensity of the Pacific!
I comprehended instantly that, by the wondrous power of my lens, I had penetrated beyond the grosser particles of aqueous matter, beyond the realms of infusoria and protozoa, down to the original gaseous globule, into whose luminous interior I was gazing, as into an almost boundless dome filled with a supernatural radiance. It was, however, no brilliant void into which I looked.
These beds are covered by others of a peculiar soft white stone, including much gypsum, and resembling chalk, but really of a pumiceous nature. It is highly remarkable, from being composed, to at least one-tenth part of its bulk, of Infusoria: Professor Ehrenberg has already ascertained in it thirty oceanic forms.
It has sometimes been objected to this nomenclature that certain species of infusoria found in the chalk are still existing, and, on the other hand, the Miocene and Older Pliocene deposits often contain the remains of mammalia, reptiles, and fish, exclusively of extinct species.
But, whether floating invisibly in the water, shell of infusoria in the seas, marble asleep in the Pentelican hills, constituting the sparkle and fizz of soda water, claiming the world's admiration as the Venus de Milo, or giving beauty and meaning to the most fitting symbol that goes between lovers, it is still the same matter.
These beds are covered by others of a peculiar soft white stone, including much gypsum, and resembling chalk, but really of a pumiceous nature. It is highly remarkable, from being composed, to at least one-tenth of its bulk, of Infusoria. Professor Ehrenberg has already ascertained in it thirty oceanic forms.
There is no room for argument about the presence of life in the plant kingdom. But there are other forms of life far below the scale of the plants. There is the world of the bacteria, microbes, infusoria the groups of cells with a common life the single cell creatures, down to the Monera, the creatures lower than the single cells the Things of the slime of the ocean bed.
He spent the later years of his life in Paris, where he was one of the founders and original members of the Académie des Sciences. Leeuwenhoek was a life-long observer of minute life. Among the results of his labours was the discovery of the infusoria, and the collection of a valuable mass of information concerning the circulation of the blood and the structure of the eye and brain.
I brought away specimens of one of the tufaceous layers of a pinkish colour and it is a most extraordinary fact that Professor Ehrenberg finds it almost wholly composed of matter which has been organised; he detects in it some siliceous-shielded, fresh-water infusoria, and no less than twenty-five different kinds of the siliceous tissue of plants, chiefly of grasses. "Monats. der Konig. Akad. d.
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