During the past ten years the trend toward the Theosophical interpretations of some of the most pressing astronomical problems has been very marked. The re-opening of questions hither considered closed or else insoluble, has been an interesting feature of recent times. For instance, the belief that gravitation alone explained the movements of the stars has been seriously shaken lately, and, if we may venture to prophesy, it looks as if physics will have to return to the ancient and Theosophical acceptance of dual forces, attraction and repulsion--perhaps magnetic--to explain the new problem of astronomy, having found that gravitation is only a half-understood truth, as Theosophy teaches. In his inaugural address, Professor Bergstrand, newly appointed to the chair of astronomy at the university of Upsala, Sweden, made a special point of the fact that some utterly unknown force or forces besides gravitation must be operating to explain some of the newest discoveries in stellar physics. He was alluding particularly to the binding together of certain groups of stars in connected drifts across the depths of space. Several of such drifting collections of stars moving together across the vast depths of kosmos at equal speed are now known. There would not be anything so extraordinary in this, and nothing that might call for the postulate of some unknown law, but for the fact that in some cases members of the same star-group are found _at far distant parts of the heavens_ separated from each other by many other stars drifting in various directions between them--our sun for one. What is the mysterious binding tie, and how may it be reconciled with the known action of gravitation? One of the fundamental principles in nature, according to Theosophy, is the Duality of manifested forces: in _The Secret Doctrine_ H. P. Blavatsky treats of this very fully, plainly declaring that the _other half_ of gravitation will have to be reckoned with before long by physical science in the West. In the East there is practical knowledge of it, among a chosen few.