...“I am glad to be able to resolve a difficulty that at one moment seemed insoluble... 
Rafael Sabatini 「Captain Blood」
... The first business of political economy, after fixing its definitions, was the solution of this problem; now, not only has it not been solved, but it has been declared insoluble...
P. J. Proudhon 「What is Property?」
...Both make insoluble compounds withmercury...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
... 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」
...On all sides it was regarded as an insoluble enigma...
Ernst Haeckel 「The Evolution of Man」
...The problem is probably insoluble...
Northcote W. Thomas 「Kinship Organisations and Group Marriage in Australia」
...The problems raised by the phratriac nomenclature are complex andprobably insoluble...
Northcote W. Thomas 「Kinship Organisations and Group Marriage in Australia」
...The metallic compounds formed by the combination of persulphomolybdicacid with a base are pulverulent, in many cases of a red colour, and forthe most part insoluble in water...
George Field 「Field's Chromatography」
...With barium, the acid furnishes ayellowish-red powder, insoluble in, but made denser by water, whichimparts to it a cinnabar colour...
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」
...Dumas, "I was induced to examine in successionall our insoluble white compounds, with regard to their adaptability topainting purposes...
George Field 「Field's Chromatography」
...We are here,of course, faced with a riddle, which is all the more tantalising fromits appearing for ever insoluble to men, chained as they are to theearth...
Cecil G. Dolmage 「Astronomy of To-day」
...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」
...Indeed, I haveheard it admitted by men of high intellectual attainments that thequestion was insoluble...
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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