..., enigma... 
Gustavo Adolfo Becquer 「Legends, Tales and Poems」
...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」
...We have here the union of two mighty instincts; and their workings throw into light, though they leave unresolved, many an enigma of the hive...
Maurice Maeterlinck 「The Life of the Bee」
...Well, this fountain of urine is the key to the enigma...
J. H. Fabre Bernard Miall 「Social Life in the Insect World」
...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」
...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」
...By whatlight? Here is the enigma...
Dolores Bacon 「Pictures Every Child Should Know」
...Moyen the half-man, half-god,the enigma of the ages...
Various 「Astounding Stories of Super-Science April 1930」
...The enigma next to be considered is of a more doubtful character thanthe myth relating to the satellite of Venus...
Richard A. Proctor 「Myths and Marvels of Astronomy」
...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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