The substance of The riddle of the universe,

Mode of access: Internet.

Biology; the key to the riddle of cancer.

Bibliography: p. 287-312.

Solving the farm riddle,

Mode of access: Internet.

The solving of the world-riddle : or the rational grounds of theism. (The metaphysics of the subject clarified, and in a nutshell) /

"Revised and reprinted from the Watchman-examiner."

The riddle of nearer Asia,

"Books for further reading": at end of each chapter.

The riddle of the night : being the record of a singular adventure of that remarkable detective genius, Hamilton Cleek, the man of the forty faces, once known to the police as the Vanishing Cracksman /

Frontispiece and plates facing p. 84, 146 and 300, illustrations on p. 20, 157 and 159.

The unsolved riddle of social justice,

Mode of access: Internet.

Life and matter; a criticism of Professor Haeckel's "Riddle of the universe", by Sir Oliver Lodge

Mode of access: Internet.

Russia is no riddle,

Mode of access: Internet.

Woman is a riddle : a comedy, as it is acted at the Theatre in Lincoln's-Inn-Fields /

According to Johnson, Savage wrote the play, which he afterwards turned over to Bullock who altered it slightly and produced it as his own; but Baker claims that both authors took it from a translation of Calderón's "La dama duende" by Mrs. Price. Cf. Johnson's Life of Savage; Baker's Biog. dram.; Dict. nat. biog.

The riddle of the Rhine; chemical strategy in peace and war. An account of the critical struggle for power and for the decisive war initiative. The campaign fostered by the great Rhine factories, and the pressing problems which they represent. A matter of pre-eminent public interest concerning the sincerity of disarmament, the future of warfare, and the stability of peace.

"The existence of this giant monopoly [Interessen gemeinschaft der deutschen teerfarbenfabriken] raises vital military and economic questions, which are ... 'The riddle of the Rhine'."--p. 14.

The riddle of personality,

Mode of access: Internet.

Woman is a riddle. A comedy.

Mode of access: Internet.

The riddle of labor relations /

Mode of access: Internet.

Riddle-rhymes : being LII wit-waking puzzle-poems for children with thinking-caps, invented, versified and arranged for a year of Saturdays by the riddle-rhyme maker /

Mode of access: Internet.