1
Apart from the cell theory, man is an insoluble enigma to us.
2
Human nature is an insoluble enigma, if this world is its only field.
3
The original color of coach and running-gear was an insoluble enigma.
4
In fact, she throws no light on this insoluble enigma.
5
On all sides it was regarded as an insoluble enigma.
6
Yet if his memory served him truthfully, he was surely face to face with an insoluble enigma.
7
Thus the three versions are developed, the origin and collocation of which appears from every other point of view to be an insoluble enigma.
8
An insoluble enigma the man might be to him, but he would not for that turn back from the task that he had undertaken.