...How to retrace their steps was now the problem, apparently insoluble... 
George Grote 「The Two Great Retreats of History」
...For example,arsenic in itself has well-marked poisonous properties, but when brought incontact with dialyzed iron it forms an insoluble compound and becomesinnocuous...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...Both make insoluble compounds withmercury...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...Another insoluble salt which enters largely into the composition of manyurinary calculi of the ox is carbonate of lime...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...How to get out? The problem would be insoluble to those two incapables, if nothing else played its part...
J. Henri Fabre Alexander Teixeira de Mattos 「The Life of the Fly」
... Straightway, oxidization works upon the product: the indigo is reformed, insoluble and blue...
J. Henri Fabre Alexander Teixeira de Mattos 「The Life of the Fly」
... I hasten to abandon these insoluble problems in order to attack the question of provisions from another point of view...
J. Henri Fabre 「More Hunting Wasps」
...This consequence,which to me seems immediate, renders the problem insoluble...
Francis Huber Anonymous 「New observations on the natural history of bees」
...Apart from the cell theory, manis an insoluble enigma to us...
Ernst Haeckel 「The Evolution of Man」
...Is an insoluble basic nitrate of bismuth, a pearly white powder of loosetexture, turning grey on exposure, and blackened by sulphurettedhydrogen...
George Field 「Field's Chromatography」
...The red being insoluble therein isprecipitated, while the acetate of lead remains dissolved...
George Field 「Field's Chromatography」
...The latter compound, which is a terchromate, isalmost insoluble in cold water, 2814 parts being required to dissolveit...
George Field 「Field's Chromatography」
...It may, indeed, be renderedcomparatively insoluble in water by ignition; but the anhydrous oxide soobtained is nearly black, and as a colour worthless...
George Field 「Field's Chromatography」
...It is insoluble inwater...
George Field 「Field's Chromatography」
...The acceptance of this theory of the heat of those heavenly bodieswhich shine by their own light—sun, stars, and nebulae—still leavesopen a problem that looks insoluble with our present knowledge...
Simon Newcomb 「Side-lights on Astronomy and Kindred Fields of Popular Science」
...Closely connected with the problem of the extent of the universe isanother which appears, for us, to be insoluble because it brings usface to face with infinity itself...
Simon Newcomb 「Side-lights on Astronomy and Kindred Fields of Popular Science」
...He thought this would make a great puzzle, truly an insoluble conundrum,to take back to bewilder his Martian friends...
Dr. D.M. Brooks 「The Necessity of Atheism」
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