ESSAYS ON THE USE AND LIMIT OF THE IMAGINATION IN SCIENCE. BY JOHN TYNDALL, LL.D., F.R.S. LONDON: LONGMANS, GREEN, AND CO. 1870. EXPLANATORY NOTE. [Illustration] To a Second Edition of a Discourse on the Scientific Use of the Imagination, delivered before the British Association at Liverpool on September 16, 1870, are here added an Address on the Limit of the Imagination in Science, delivered before the Mathematical and Physical Section of the Association at Norwich on August 19, 1868, and a short Essay, entitled ‘Earlier Thoughts.’ The Address and the Essay were meant to be brief, but definite statements of the relation of Life and Consciousness to Matter and Force. As in the case of the recent Discourse, opinion was divided with regard to the objects and merits of the Norwich Address. On the one hand, two eminent clergymen, one of the Church of England, the other a Dissenter, proposed and seconded respectively a vote of thanks, which was liberally carried by the section; on the other hand, I was publicly warned that, as a consequence of my impiety, the bolts of heaven were in a state of potential suspension above my head, ready to descend if further drawn upon. My main object, both at Norwich and at Liverpool, was, firstly, to dissipate the repugnance, and indeed terror, which in many minds are associated with the thought that science has abolished the mystery of man’s relation to the universe; and, secondly, to remove the hindrance which popular notions regarding the origin of life oppose to legitimate scientific speculation. ATHENÆUM CLUB: _November_ 1870. CONTENTS. [Illustration] PAGE PROS AND CONS TOUCHING THE FIRST EDITION 1 SCIENTIFIC USE OF THE IMAGINATION 13 SCIENTIFIC LIMIT OF THE IMAGINATION 52 EARLIER THOUGHTS 66 PROS AND CONS TOUCHING THE FIRST EDITION. [Illustration] _From the_ TIMES, _Sept._ 19, 1870.