...How to retrace their steps was now the problem, apparently insoluble... 
George Grote 「The Two Great Retreats of History」
...“I am glad to be able to resolve a difficulty that at one moment seemed insoluble...
Rafael Sabatini 「Captain Blood」
...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」
...A less common constituent of urinary calculi is the insoluble oxalate oflime...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...Apart from the cell theory, manis an insoluble enigma to us...
Ernst Haeckel 「The Evolution of Man」
...The problems raised by the phratriac nomenclature are complex andprobably insoluble...
Northcote W. Thomas 「Kinship Organisations and Group Marriage in Australia」
...The latter compound, which is a terchromate, isalmost insoluble in cold water, 2814 parts being required to dissolveit...
George Field 「Field's Chromatography」
...This colour is insoluble in water, and it has theobjection of remaining partially suspended for an almost indefinitetime, colouring the liquid light red...
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」
...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」
...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」
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