...Fortunately the supper-room was deserted: this would make Chauvelin’stask all the easier, when presently that unsuspecting enigma would enter italone... 
Baroness Orczy 「The Scarlet Pimpernel」
...The whole scene was a perfect enigma for Raoul, the key to which he would have given anything to obtain...
Alexandre Dumas, Pere 「Ten Years Later」
...She thought she had solved the enigma...
Lucy Foster Madison 「Bee and Butterfly」
...On all sides it was regarded as an insoluble enigma...
Ernst Haeckel 「The Evolution of Man」
...Apart from the cell theory, manis an insoluble enigma to us...
Ernst Haeckel 「The Evolution of Man」
...By whatlight? Here is the enigma...
Dolores Bacon 「Pictures Every Child Should Know」
...What did Barter mean? Seeking some answer to the enigma, Bentleystudied the ape anew...
Various 「Astounding Stories, June, 1931」
...At the touch of a lever which layunder one of Dirk’s hands the planerose straight out of the water, and hemaneuvered it directly over the top ofthe strange enigma...
Various 「Astounding Stories of Super-Science, March 1930」
...Before the close of 1610, Galileo excited the curiosity of astronomersby the publication of his first enigma...
David Brewster 「The Martyrs of Science, or, The lives of Galileo, Tycho Brahe, and Kepler」
...In 1656, Huygens, with a telescope constructed by himself, was enabledto solve the enigma which for so many years baffled the efforts of theablest astronomers...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...It is only during a comparatively smallpart of its path that those elaborate movements are accomplished whichpresented such an enigma to the primitive observer...
Robert Stawell Ball 「The Story of the Heavens」
...—Is there perhaps some enigma therein? Probably; but fortunately nothing for my own teeth...
Friedrich Nietzsche Helen Zimmern 「Beyond Good and Evil」
...Her nature was an enigma to him; her mind was a puzzle which would not be pieced together with the rectangular correctness of ordinary life...
Marcus Clarke 「For the Term of His Natural Life」
..., and that itsfinal course was an enigma not to be solved without much more research...
Thomas Mitchell 「Journal of an Expedition into the Interior of Tropical Australia」
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