_In 2 vols. foolscap 8vo, cloth, lettered, with Coloured Plates, and several hundred Figures of Fossil Remains, price One Guinea._ THE MEDALS OF CREATION; OR, FIRST LESSONS IN GEOLOGY, AND IN THE STUDY OF ORGANIC REMAINS. These volumes comprise a Popular Introduction to the study of Organic remains, and a general view of Fossil Botany and Zoology. Geological Excursions to some of the most interesting places in England are described, in illustration of the method of observing and investigating Geological Phenomena, and of collecting Organic Remains. Ample instructions are given for the development and arrangement of Fossil _Vegetables_, _Corals_, _Shells_, _Bones_, _Teeth_, &c.: and practical directions for the microscopical examination of rocks composed of Fossil Infusoria, and the intimate structure of mineralized Plants, Teeth, &c. In fine, these volumes are offered as a popular guide and hand-hook for the Student and Amateur Collector of Fossil Remains, and the Reader who may desire a general acquaintance with a science replete with objects of the highest interest; and for the Tourist who may wish, in the course of his travels, to employ profitably and agreeably a leisure hour, in the various districts he may visit. Such a work has long been required; and the present will be found to comprise all that can reasonably be expected in two pocket volumes. The plates are alike beautiful and faithful representations of the originals. "Very rarely can we find a work which is so perfect an example of the art of book, making, in the best understanding of that term; we mean technically and _mechanically_ as well as _intellectually_. Dr. Mantell's 'Medals of Creation' are, indeed, among the _chef d'oeuvres_ of the art; and, being elegantly bound in embossed covers, of the still portable size of the larger 12mo, will and must take their place as the companions, not only of the geologist in his study, but in the field; while they will also accompany the intelligent travellers of both sexes as most instructive and delightful Mentors in their journeyings among the grand and beautiful scenes of our globe. This work is a _classic of high excellence_, of great research, and formidable labour; and we cannot close our remarks without again expressing our admiration of the perspicuity, method, and condensation by which it is distinguished."--_American Journal of Science for January_, 1845. _In one volume square 8vo, with 12 coloured plates; price 10s._ THOUGHTS ON ANIMALCULES; OR, A GLIMPSE OF THE INVISIBLE WORLD REVEALED BY THE MICROSCOPE.