Man's future largely depends on the possibil-ity of his becoming truly scientific and truly spiritual in one. Is this at all possible ? The thesis of this small book is that it is possible. Its content was originally published in the June, July and August 1966 issues of the Vedanta Kesari, a monthly organ of the Rama-Krishna Order. We are thankful to the President of Sri Ramakrishna Math, Madras, for kind permission to reproduce it in the present form. We hope earnest and inquiring minds deeply interested in both Science and Religion will welcome the publication.