[Illustration: A RECRUITING PLACARD FOR THE INTERNATIONAL MONTHLY, VOLUME 4, NO. 4, NOVEMBER 1, 1851 *** Produced by Jon Richfield FRAGMENTS OF SCIENCE: A Series of Detached ESSAYS, ADDRESSES, AND REVIEWS. BY JOHN TYNDALL, F.R.S. Printed By Spottiswoode AND CO. 1879. All rights.