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be reliable. A parallel case of this will be found in the recent more successful achievements of the physicist and mathematician. In 1925 Heisenberg laid down the fundamental idea that nothing should enter the mathematical formulation except such things as could be directly observed. This has had far-reaching consequences, and seems to point the way to a complete solution of the problem of the atom and of radiation. (‘The Quantum’, Allen, p. 224.) A study of the work of Heisenberg and his school during the last two years is, perhaps, the best preparation for the intelligent understanding of the work from which five observations are recorded here, and the whole of which will shortly be offered for publication. “Some estimate of the importance of the work of Heisenberg can be formed when it is realized that it brings to a close the age-long conflict between religion and science. In this connection Prof. Eddington says that from Heisenberg’s work, about the year 1927, religion first became possible for the reasonable scientific man, and not only religion, but also the ordinary aspects of life. According to Eddington, the year 1927 will certainly rank as one of the greatest epochs in the development of scientific philosophy. (‘The Nature of the Physical World’, p. 350.) “The results of Heisenberg’s work is fully confirmed by the new ‘WaveMechanics’, or ‘Quantum- Mechanics’, as developed by Schrodinger de Broglie and others, which is based on waves or ripples, not in the ether, the seat of light waves, etc., but in a sub-ether, in which are vibrations one million times faster than those of visible light. (ib. p. 211.) The interaction of these waves in the sub ether causes beats or splashes in the familiar ether of science, and these beats are the electrons and atoms of matter, which affect our gross consciousness, the waves of the sub-ether being too rapid to affect the physical consciousness (ib. p. 215.) But these waves in the sub-ether are not too rapid to affect the developed consciousness, such as has been used in these observations. In fact, the acquirement of this new power of observation is exactly the art of tuning up the consciousness to these sub-etheric wave-lengths. “The nature of this process of tuning up the consciousness may be best understood in connection with the X-rays, and, for simplicity, it may be regarded as a kind of X-ray consciousness. Expressed in terms of difference of potential, the ordinary electromagnetic vision of light rays corresponds to a quantum energy of 2 volts. X-rays correspond to a potential difference of a few hundred volts to 300,000 volts. The Y-ray frequency corresponds to 3 and 4 million volts,