VI. A cluster of Calcite crystals
VII. Various species of bacteria
VIII. Various species of fresh-water algae
Author's Note
The author makes grateful acknowledgment of the help he has gained from other works in the wide field opened up by Rudolf Steiner, and of his debt to the friends who in various ways assisted him in preparing his manuscript.
Quotations have been made from the following books by kind permission of their respective publishers:
The Life of Sir William Crookes by E. E. Fournier d'Albe (Messrs. Ernest Benn Ltd.);
Man the Unknown by A. Carrel (Messrs. Hamish Hamilton Ltd.);
The Philosophy of Physical Science and The Nature of The Physical Worldly A.. Eddington (University Press, Cambridge);
Science and the Human Temperament by E. Schrödinger (Messrs. George Allen and Unwin Ltd.);
Centuries of Meditations and Poetical Works by Th. Traherne (Messrs. P. J. and A. E. Dobell).
Preface