...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」
... “Yes,” he said, “that is the key of the whole enigma...
Alexandre Dumas, Pere 「Louise de la Valliere」
...The problem of the haricot stood thus, almost elucidated by thetestimony of the insect world alone, when an unexpected witness gave methe last word of the enigma...
J. H. Fabre Bernard Miall 「Social Life in the Insect World」
...She thought she had solved the enigma...
Lucy Foster Madison 「Bee and Butterfly」
...His the eye that readsat a glance the signs that to the ordinarysight are a blank or at most are anuntranslatable enigma...
Rowland E. Robinson 「In New England Fields and Woods」
...What did Barter mean? Seeking some answer to the enigma, Bentleystudied the ape anew...
Various 「Astounding Stories, June, 1931」
...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」
...We are thus led toconnect the formation of the tail with the approach to the sun, and weare accordingly in the presence of an enigma without any analogy amongthe other bodies of our system...
Robert Stawell Ball 「The Story of the Heavens」
...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」
..., 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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