Nodules, phosphatic, in azoic rocks, 269. Oak, varieties of, 51. Organs of extreme perfection, 167. Ornithorhynchus, 100, 362. Owen, Prof., on birds not flying, 123. on variable length of arms in ourang- on the swim-bladder of fishes, 171. on fossil horse of La Plata, 279. on fossil birds of New Zealand, 296. on the metamorphosis of cephalo- acific Ocean, faunas of, 304. Paley on no organ formed to give pain, Pallas on the fertility of the wild stocks Paraguay, cattle destroyed by flies, 71. Partridge, dirt on feet, 316. Parts greatly developed, variable, 136. Parus major, 164. Passiflora, 221. Peaches in United States, 81. Pear, grafts of, 231. Pelargonium, flowers of, 132. sterility of, 222. Pelvis of women, 131. Peloria, 132. Period, glacial, 318. Petrels, habits of, 165 Phasianus, fertility of hybrids, 224. Philippi on tertiary specles in Sicily, 273. on rate of organic change, 274. on close alliance of fossils in con. on embryological succession, 295. breeds described, and origin of, 25. reverting to blue color, 144. carriers, killed by hawks, 315. Pistil, rudimentary, 392. Plants, poisonous, not affecting certain selection applied to, 36. gradual improvement of, 40. not improved in barbarous countries, 40. Robinia, grafts of, 231. Rodents, blind, 125. Rudimentary organs, 391. Sphex, parasitic, 195. Rudiments important for classification, Spiders, development of, 384. 362. Sageret on grafts, 231. Salmons, males fighting, and hooked jaws Salt water, how far injurious to seeds, 312. Sea-water, how far injurious to seeds, 812. on selection of pigeons, 34. Sedgwick, Prof., on groups of species sud- Seedlings destroyed by insects, 66 winged, 133. power of resisting salt water, 312. in crops and intestines of birds, 315. in mud, 337. hooked, on islands, 341. Selection of domestic products, 33. natural, 77. sexual, 83. Spitz-dog crossed with fox, 236. Sprengle, C. C., on crossing, 92. on ray-florets, 132. Squirrels, gradations in structure, 162. Sterility from changed conditions of life, 16. of hybrids, 218. from unfavourable conditions, 234. St. Helena, productions of, 339. St. Hilaire, Aug, on classification, 364. Stocks, aboriginal, of domestic animals, 23. Structure, degrees of utility of, 179. Succession, geological, 273. Succession of types in same areas, 295. 74. natural, circumstances favourable Swim-bladder, 170. to, 95. Sexes, relations of, 83. Sexual characters variable, 141. selection, 83. Sheep, Merino, their selection, 35. System, natural, 360. Tail of giraffe, 174. of aquatic animals, 175. two sub-breeds unintentionally pro- Tarsi deficient, 123. Tobacco, crossed varieties of, 230. on the Malay Archipelago, 344. Water, fresh, productions of, 334. Tomes, Mr., on the distribution of bats, Waterhouse, Mr., on Australian marsu- 343. Type, unity of, 184. Types, succession of, in same areas, 295. Udders enlarged by use, 17. rudimentary, 392. Ulex, young leaves of, 382. Umbelliferæ, outer and inner florets of, 131. Use, effects of, under domestication, 17. effects of, in a state of nature, 122, Valenciennes on fresh-water fish, 335. caused by reproductive system being Variations appear at corresponding ages, 20, 82. analogcus in distinct species, 144. Varieties, natural, 46. struggle between, 73. domestic, extinction of, 104. when crossed, sterile, 237. Verbascum. sterility of, 222. pials, 108. on greatly developed parts being on cells of bees, 200. on general affinities, 373. Watson, Mr. H. C., on range of varieties on acclimatisation, 128. on Alpine plants, 320, 327. on rarity of intermediate varieties, Weald, denudation of, 250. West Indian islands, mammals of, 344. on the tarsi of Engidæ, 142. on the antennæ of hymenopterous Whales, fossil, 265. Wheat, varieties of, 105. White Mountains, flora of, 318. of insects homologous with bran rudimentary, in insects, 391. of Falkland Isles, 343. Wollaston, Mr., on varieties of insects, 50 on colours of insects on sea-shore, 121. Verneuil, M. de, on the succession of spe- Youatt, Mr., on selection, 34. cies, 284. Viola tricolor, 71. Volcanic islands, denudation of, 249. on sub-breeds of sheep, 39. on rudimentary horns in young cat- Zebra, stripes on, 147. Wading birds, 337. THE Correlation and Conservation of Forces. WITH AN INTRODUCTION AND BRIEF BIOGRAPHICAL NOTICES. By EDWARD L. YOUMANS, M.D. 12mo, 490 pages. CONTENTS. I. By W. R. GROVE. The Correlation of Physical Forces. III. By J. R. MAYER. IV. By Dr. FARADAY. V. By Prof. LIEBIG. 1. Remarks on the Forces of Inorganic Nature. 3. On the Mechanical Equivalent of Heat. VI. By Dr. CARPENTER. The Correlation of the Physical and Vital Forces "This work is a very welcome addition to our scientific literature, and will be particularly acceptable to those who wish to obtain a popular, but at the same time precise and clear view of what Faraday justly calls the highest law in physical science, the principle of the conservation of force. Sufficient attention has not been paid to the publication of collected monographs or memoirs upon special subjects. Dr. Youmans' work exhibits the value of such collections in a very striking manner, and we earnestly hope his excellent example may be followed in other branches of science."-American Journal of Science. "It was a happy thought which suggested the publication of this volume. The question is often asked, and not so easily answered, What are the new doctrines of the Correlation and Conservation of Forces? In this volume we have the answer, and with the reasons of its chief expounders; those who are ignorant on that theme, can thus question the original authorities."-New Englander. "We here have the original expositions of the new Philosophy of Forces, accompanied by an excellent exposition of both the expositions and the expositors; the wholo will be a rare treat to the lovers of advancing scientific thought."-Methodist Quarterly Review. "This is, perhaps, the most remarkable book of the age. We have here the latest discoveries, and the highest results of thought concerning the nature, laws, and connections of the forces of the universe. No higher or more sublime problem can engage the intellect of man than is discussed by these doctors of science intent alone on arrivLag at the truth."-Detroit Free Press. "This work presents a praiseworthy specimen of complete and faithful authorship, and its publication at this time will form an epoch in the experience of many thinking minds."- ibuna A NEW CLASS-BOOK OF CHEMISTRY. BY EDWARD L. YOUMANS, M. D. 460 Pages. 910 Engravings. Price $1 75. The Class-Book of Chemistry, published some ten years ago, has been rewritten, re Mlustrated, and much enlarged, and now appears as an essentially new work. Its aim is to present the most important facts and principles of the science in their latest aspects, and in such a manner as shall be suitable for purposes of general education. This volume brings up the science to the present date, incorporating the new discoveries, the corrected views, and more comprehensive principles which have resulted from recent Inquiry. Among these may be mentioned the newly-received doctrines of the nature of Heat, the interesting views of the Correlation and Conservation of Forces, the discoveries in Spectrum Analysis, and the new and remarkable researches on the artificial production of organic substances, and on the crystalloid and colloid conditions of mat ter, with many other results of recent investigations not found in contemporary textbooks. For philosophical accuracy of arrangement, clearness of statement, and felicity of illustration, the Class-Book is unsurpassed.-N. Y. Teacher. Prof. Youmans possesses a rare faculty for bringing the intricacies of science right within the comprehension of the masses of readers, and his book presents all the interest of a novel.-Boston Post. The most recondite topics are placed in a transparent light before the common mind, the language is eminently choice and attractive, not an unwieldy paragraph, scarcely a superfluous word can be found from the beginning to the end of the work, and, in spite of the extreme economy of expression, there is no apparent constraint or formality, but every page flows smoothly and gracefully along, presenting a rare model of lucid and agreeable didactic statement.-N. Y. Tribune. The chapters on the Mutual Relations of the Forces, and on the Dynamics of Vege table Growth, are alone worth the price of the volume.-B. F. Leggett, Prof. Nat. Science, Whitewater College, Ind. The present volume exhibits plentiful traits of what we believe we have before called Prof. Youmans' educational genius.-Methodist Quarterly Review. Unrivalled as a practical treatise. Its introduction on the "Origin and Nature of Scientific Knowledge" should be read by every teacher.-Mass. Teacher. One of its peculiar merits is that it can all be taught.-Prof. Phelps, N. J. Normal School. Clear, accurate, recent, and imbued with the enthusiasm of its author.-R. M. Manley, Pres. N. H. Fem. College. It is eminently terse and compact, is amply and lucidly illustrated, and few of our many class-books that have crossed the ocean and been welcomed in Europe, are calcu lated to do us more credit than this admirable work,-N. Y. Independent. A thorough perusal of the book enables us to pronounce it the best elementary chemistry that has been written in our language. It is penetrated by a fearless yet dis ciplined scientific spirit, and is completely up to the level of the latest discoveries in the science of which it treats. We have read it with all the interest usually given to romance.-New Nation. This manual is distinguished from most other Class-books in setting almost wholly aside what is merely technical and experimental, for the sake of the completest possible exhibition of the principles of the subject. For the thorough student, and even for the general reader, a careful, lucid, and connected exposition of the new views was needed. such as we are glad to acknowledge in the present volume. The author has given an Intellectual value to his treatise very much above the standard aimed at in similar works-Christian Examiner. |