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Natterer increased this pressure to two thousand seven hundred atmospheres, or twenty-one tons to the square inch, with the same negative results. The result of Andrews' experiments in particular was the final proof of what Cagniard de la Tour had early suspected and Faraday had firmly believed, that pressure alone, regardless of temperature, is not sufficient to reduce a gas to the liquid state.

It would be a noble work, but one requiring years of labour, as of course you would wish to incorporate all existing materials and would have to spend months in Berlin and Milan and Paris to study the collections of Spix, Natterer, Oscolati, Castituan and others, as well as most of the chief private collections of Europe. I hope you may undertake it and bring it to a glorious conclusion.

We trust M. Natterer will extend his benevolent labors to all the great libraries. In the paragraphs devoted to the optical relations of the atmosphere, our author has shown a happy faculty for making his subject obscure.

But in 1844 Faraday returned to them, armed now with new weapons, in the way of better air-pumps and colder freezing mixtures, which the labors of other workers, chiefly Thilorier, Mitchell, and Natterer, had made available.

The hands of the European consuls are tied, and jealousies interwoven with the Turkish question act as a bar to united action on the part of Europe; no Power cares to be the first to disturb the muddy pool. The Austrian consul at Khartoum, Herr Natterer, told me, in 1862, that he had vainly reported the atrocities of the slave-trade to his Government NO REPLY HAD BEEN RECEIVED to his report.

In regard to the extent to which the compression of air has been actually carried, he tells us that 'Brockhaus says that air has as yet been compressed only into one-eighth of its original bulk. Is it possible that a writer on Meteorology is unacquainted with the well-known experiments of Dulong and Arago, and the more recent ones of Regnault, in which the compression was three times the amount here stated, or that he requires to be referred to those of Natterer, who, by a powerful condensing apparatus, has lately compressed seven hundred and twenty-six volumes of air into a single volume?"

M. Natterer, of Vienna, discovered a process for obtaining proofs on iodized plates with the chloride of sulphur, without the use of mercury.