Behold the stars! By R. G. Aitken.
Radiation, by J. A. Crowther.
The universe as a whole, by A. S. Eve.
The earth as the home of man, by B. Willis.
The ascent of mind, by C. L. Morgan.
The oneness and uniqueness of life, by E. W. MacBride.
Adaptations in the plant world, by C. S. Gager.
The chemical romance of the green leaf, by H. E. Armstrong.
Intelligent plan in nature, by M. M. Metcalf.
Design and purpose in the universe, by Sir O. Lodge.
The mystery of nature, by Sir F. Younghusband.
Unity and intelligence in nature, by D. F. Fraser-Harris.
The breakdown of materialism, by H. Driesch.
The wonder of life, by Sir J. A. Thomson.