Le comte Immon

in Bulletin de la Classe des Lettres et des Sciences Morales et Politiques (1898), XXXV, 3(3e série),

Sur la cause de l'absence de coloration de certaines eaux limpides naturelles

in Recueil des Travaux Chimiques des Pays-Bas et de la Belgique. 2e série (1898), XVII

Spring, W. Recueil des Travaux Chimiques des Pays-Bas (1898), 17, 359-75; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). Compare Abstr., 1884, 259 ... [more ▼]

Spring, W. Recueil des Travaux Chimiques des Pays-Bas (1898), 17, 359-75; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). Compare Abstr., 1884, 259, and Bull. Acad. roy. Belg., 1886, [iii], 12, 814, and 1897, [iii], 34, 578. Although it is well recognised that pure water is blue when viewed through a thickness greater than 1 metre, the only natural waters which appear blue are those of mountain streams which have their origin in the ice and snow of great altitudes. Berzelius has stated (Jabresbericht, 1830, 9, 207) that the extraordinarily clear water of Lake Wettern, in Sweden, is perfectly colourless when viewed through a thickness of more than 32 feet, and has hence raised objection to the view that pure water is blue. The author has previously shown (loc. cit.) that if water contains one ten-millionth part of its weight of colloidal ferric hydroxide, it no longer appears blue, but green in colour; with quantities greater than this, the colour is yellow or brown. By macerating fragments of a red rock, such as a Devonian schist, during several weeks with frequently renewed hot caustic potash, and subsequently washing with water by repeated decantation, a point is ultimately reached when the red coloring-matter ceases to subside from the washing water, even after standing several months; the particles of suspended ferric oxide (haematite) are no longer visible under a magnifying power of 150 diameters, and probably correspond with the dust of the Devonian epoch. On adding a few drops of this turbid solution to a large volume of pure water, the latter is rendered perfectly clear and colourless when viewed through a thickness of 6 metres. When the proportion of ferric oxide, however, is increased, the water quenches more and more of the transmitted light, until it finally becomes opaque, although appearing red by reflected light. These observations explain the fact that terrestrial waters rarely appear blue. That the waters of Alpine streams are generally blue is probably due to their being entirely free from suspended anhydrous ferric oxide; the cosmic dust with which they are often contaminated consists principally of meteoric iron, which possesses different optical properties from haematite, and is incapable of destroying the natural blue colour of the water. Reprinted with the permission of the American Chemical Society. Copyright © 2010. American Chemical Society (ACS). All Rights Reserved. [less ▲]

Note sur un oxyde de fer tétrahydraté

in Recueil des Travaux Chimiques des Pays-Bas et de la Belgique. 2e série (1898), XVII

Spring, W. Recueil des Travaux Chimiques des Pays-Bas (1898), 17, 222-3; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). If the voluminous ... [more ▼]

Spring, W. Recueil des Travaux Chimiques des Pays-Bas (1898), 17, 222-3; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). If the voluminous precipitate obtained by the addition of ammonia to a dilute solution of ferric chloride or sulphate is dried spontaneously at the ordinary temperature, a vitreous substance is obtained, which is black in mass but red by transmitted light. It has the composition Fe2O3,4H2O. Placed in a desiccator, it loses water; its sp. gr. = 2.436 at 15°, and it is not decomposed by pressure. Reprinted with the permission of the American Chemical Society. Copyright © 2010. American Chemical Society (ACS). All Rights Reserved. [less ▲]

Sur l'origine de la couleur bleue du ciel

in Bulletin de l'Académie Royale des Sciences, des Lettres et des Beaux-arts de Belgique. Sciences. 3e série (1898), XXXVI(12), 504-518

Sur la cause de l'absence de coloration de certaines eaux limpides naturelles

in Bulletin de l'Académie Royale des Sciences, des Lettres et des Beaux-arts de Belgique. Sciences. 3e série (1898), XXXVI(9-10), 266-276

Spring, W. Bulletin de la Classe des Sciences, Academie Royale de Belgique (1898), 38(3), 266-76 ; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010 ... [more ▼]

Spring, W. Bulletin de la Classe des Sciences, Academie Royale de Belgique (1898), 38(3), 266-76 ; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). Tying to its earlier reports over the role of the iron compounds and the humin substances with the feature of the coloring of water and over the elimination of this substances under influence of sunlight, etc. (Bulletin Acad. roy. Bolgique [3] 34. 578; C. 98. I. 410 and Rec. trav. chim. Pays-Bas 17. 202; C. 98. II. 224) author the cause of the colorlessness many discusses clear waters, about what already Berzelius (Annual Report f. Chemistry 9. 207) expressed its astonishment. Terrestrial water only very rarely will appear blue, since in all ground are traces of hematite, and this the blue color water for our eye compensates. On the other hand the glaciers and the snow of high peaks do not contain hematite, water from high regions throw their blue and therefore can maintain their color. Furthermore the influence of the iron compounds on the coloring water is very differenct, depending on whether they are in the form of their hydrates or anhydrous oxides in the water; into latter trap they step with the Humin or the organic substances water not into reaction, the water more generally continues to appear colorless. Reprinted with the permission of the American Chemical Society. Copyright © 2010. American Chemical Society (ACS). All Rights Reserved. [less ▲]

Sur les causes de la variété des teintes des eaux naturelles et sur la clarification des liquides par l'électricité

in Société chimique de Belgique (Ed.) Walthère Spring : Oeuvres complètes (1898)

Les premiers siècles de l'abbaye de Saint-Hubert

in Bulletin de la Commission Royale d'Histoire (1898), VIII, 1(5e série), 7-112

La bataille de Vouillé en 507

in Revue des Questions Historiques (1898), LXIV

Les maladies microbiennes

Speech (1898)

Carbone (oxyde de)

in Richet, Charles (Ed.) Dictionnaire de physiologie. 003. Tome III (1898)