From the preface:
This book is about the beauty and the reality of the polar formations of space. It was written with three aims in view: first, to offer to a wider public a spiritually fitting introduction to modern geometry; second, to provide new material for teaching in the highest classes of genuinely progressive schools and colleges; third, to awaken an awareness of the polar formation of everything spatial. Being closely connected, the aims can be dealt with together.

Translated by Paul Courtney

Also available in print version from AWSNA Publications