Principles of Zoology
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"Lt -- i*' •■■ i/irA_:.;i.5 iA YjfjgA-} %.o T't . , aT- ■ \ S ^-'i -:- : ; '-r- . >s*-« ■- i^Vr '. "• '■. ■.; '^^ ,v ,* ^ ^Lri. ■ ^ . - P' ^ . j j -n - 'v .'-^ ic^: i’*^— r r-!: '>/ A i \ '. ^/< ’ • ?* * ** “ ‘^K Ht^-.'i- 'S '.' •'■■%. ^'4 ••f. - I. V, ^:/:'..;'.i, J • ;s'/^ \* ••■ ?T-’^'.’ -♦■ ■’* * ■ 'at;w^T or tftR EA-aw a.§ rku. zookoc-r. ■ A, ■*. :j'^ •‘tv;!;,, ■ ^ I—'* r Principles TOUCHING THE STRECTUEE, DEVELOPMENT, DISTPJBUTION, AND NATURAL ARRANGEMENT or THE llACES OF ANUIALS, LIVING AND EXTINCT. WITH NUMEROUS ILLUSTRATIONS. PART I. COMPARATIVE PHYSIOLOGY. FOR THE USE OF SCHOOLS AND COLLEGES. BY LOUIS AGASSIZ and A. BOSTON; GFOXJIL.D 59 WASIIINOTON 8TKEET. NEW YORK: SHEEDON AND COMPANY. 1873. Entered according to Act of Congress, in the year 1873. by GOULD AITD LIJTCOLN, In the office of the Librarian of Congress, at Washington, PREFACE. 1’he design of this work is to furnish an epitome of the leading principles of the science of Zoology, as deduced from the present state of knowledge, so illustrated as to be intelligible to the begin¬ ner. No similar treatise now exists in this country, and, indeed, some of the topics have not been touched upon in the English lan¬ guage, unless in a strictly technical form, and in scattered articles. On this account, some of the chapters, like those on Embryology and Metamorphosis, may, at first, seem too abstruse for scholars in our common schools. This may be the case, until teachers shall have made themselves somewhat familiar with subjects comparatively new to them. But so essential have these subjects now become to a correct interpretation of philosophical zoology, that the study of them 'wiU hereafter be indispensable. They furnish a key to many phenomena vhich have been heretofore locked in mystery. Being intended for American students, the illustrations have been drawn, as far as possible, from American objects : some of them are presented merely as ideal outlines, which convey a more definite idea than accurate sketches from nature ; others have been left im¬ perfect, except as to the parts especially in question ; a large propor¬ tion of them, however, are accurate portraits from original drawings. Popular names have been employed as far as possible, and to the scientific names an English termination has generally been given; but the technical terms have been added, in brackets, whenever mis¬ understanding -was apprehended. Definitions of those least hkely to be understood, may be found in the Index. The principles of Zoology developed by Professor Agassiz in his published works have been generally adopted in this, and the results Df many new researches have been added. The authors gratefully acknowledge the aid they have received. In preparing the illustrations and, working out the details, from Mr. !• 6 PREFACE. E. Desi)r for many years an associate of Professor Agassiz, from Count Pourtales and E. C. Cabot, Esq., and also from Professor Asa Gray, by valuable suggestions in the revision of the letter-press. The first part is devoted to Comparative Anatomy, Physiology, and Embryology, as the basis of Classification, and also to the illus¬ tration of the geographical distribution and the geological succession of Animals; the second to Systematic Zoology, in which the prin- ciples of Classification will be applied, and the principal groups of animals will be briefiy characterized. Should our aim be attained, this work will produce more enlarged ideas of man’s relations to Nature, and more exalted conceptions of the Plan of Creation and its Great Author. Boston, June 1, 1848. PREFACE TO THE REVISED EDITION. In revising the present w'ork, the authors have endeavored to render more precise those passages which admitted of too broad a signification or of a double interpretation; and to correct such errors as had arisen from inadvertence, or such as the rapid progress of Sci¬ ence has disclosed. They are indebted for many suggestions on these points to several distinguished teachers w'ho have used the work as a text book, and more especially to Professor Wyman, of Harvard University. Several entirely new paragraphs have also been added. A list of some of the principal authors who have made original researches, or of treatises which enter more into detail than was ad¬ missible in an elementary work, has been given at the close of the volume, for the use of those who would pursue the subject of Zoology in a more extended manner. The work having thus been revised and enlarged, the authors sub¬ mit it to the public with increased confidence in its accuracy and usefulness. Boston, Fehruary 1, 1851. TABLE OF CONTENTS. INTRODUCTION .... ... 7 CHAPTER FIRST. The Sphere and pundamental Principles of Zo-3looy 1i5 CHAPTER SECOND. General Properties op Organized Bodies ... SECTION I. Organized and Unorganized Bodies. ci6 SECTION II. Elementary Structure of Organized Bodies .... 36 SECTION III. Differences between Animals and Plants. il CHAPTER THIRD. Functions and Organs of Animal Life , . , . 44 SECTION I. OJ the Nervous System and General Sensation . • ,44 8 TABLE OF CONTENTS SECTION II. Of tJie fecial Senses. ,48 1. Of Sight. 48 2. Of Hearing. ,,, 55 3. Of Smell.60 4. Of Taste. , , . 62 5. Of Touch. 63 6. -Of the Voice ... 64 CHAPTER FOURTH. Or Intelligence and Instinct . - . 67 CHAPTER FIFTH. Of Motion. ... 73 SECTION I. d-pparatics of Motion. ... 73 SECTION II. Of Locomotion 79 1. Plan ol the Organs of Locomotion . 82 2. Of Standing, and the Modes of Progression ... 88 Walking.90 Running.91 Leaping.91 Climbing.92 Flying.92 Swimming.93 CHAPTER SIXTH. Of Nutrition.96 SECTION I. Of Digestion . - . ..97 Digestive Tube .... .... 9? Chymification.100 Chylification.100 Mastication ... .... 101 In salivation . ■ . 108 Deglutition ... ... 108 TABLE OF CONTENTS. 9 CHAPTER SEVENTH. Pagw Cp the Blood and Circulation Ill CHAPTER EIGHTH. Op Respiration . 118 CHAPTER NINTH. Or TU£ Secretions.'126 CHAPTER TENTH. Embryology. ISi SECTION I. Of the Egg. 131 Form of the Egg. 13di Formation of the Egg.iSJ Ovulation.. 134 Laying.135 Composition of the Egg . ... 137 SECTION II. Development of the Young within the Egg.iot) SECTION III. Zo">logical Importance of Embryology. 1/3 CHAPTER ELEVENTH. Peculiar Modes op Reproduction.15t) SECTION 1. Qemmiparo^cs and Fissiparous Reproduction . 156 SECTION II. Alternate and Equivocal llc2)rodnction m 10 TABLE OF CONTENTS. SECTION III. Conscqjiences of Alternate Generation .... , 167 CFIAPTER TWELFTH. Metamorphoses of Animals. I7I CHAPTER THIRTEENTH. Geooraphicai Distribution of Animals . iBG SECTION I. General Laws of Distribution .... , l&G f SECTION II. Distribution of the Faunas. 194 I. Arctic Fauna. 197 II. Temperate Faunas. IDS III. Tropical Faunas. 2U4 SECTION III. Cvf elusions . 207 CHAPTER F0URTEI:K Geolcoical Succession of Animals; or, TPEiT DTS'i*».r»uT.oN IN Time.214 SECTION I. Structure of the Earth's Crust.214 SECTION II. Ages of Nature. 221 Palaeozoic Age ... .... !223 Secondary Age ... ..... 227 Tertiary Age. 223 Modern Age .... « . • . 235 Conclusions ... 2S5 EXPLANATION OP THE PIGTJKES. Frontispiece. — The diagram opposite the title page is intended to ^resent, at one view, the distribution of the principal types of animals, and the order of their successive appearance in the layers of the earth’s crust. The four Ages of Nature, mentioned at page 221, are represented by four zones, of diSerent shades, each of which is subdivided by circles indicating the number of formations of which they are composed. The whole disk is divided by radiating lines into four segments, to include the four great departments of the Animal Kingdom; the Vertebrates, with Man at their head, are placed in the upper compartment, the Articulates at the left, the Mollusks at the right, and the Radiates below, as being the lowest in rank. Each of these compartments is again subdivided to include the different classes belonging to it, which are named at the outer circle. At the centre is placed a figure to represent the primitive egg, with its germinative vesicle and germinative dot, (278,) indicative of the universal origin of all animals, and the epoch of life when all are appar¬ ently alike, (275, 276.) Surrounding this, at the point from which each department radiates, are placed the symbols of the several departments, as explained on page 155. The zones are traversed by rays which repre¬ sent the principal types of animals, and their origin and termination in¬ dicates the age at whicli they first appeared or disappeared, all those which reach the circumference being still in existence. The width of the ray in¬ dicates the greater or less prevalence of the type at different geological ages. Thus, in the class of Crustaceans, the Trilobites appear to com¬ mence in the earliest strata, and to disappear with the carboniferous for¬ mation. The Ammonites also appeared in the Silurian formation, and did not become extinct before the deposition of the Cretaceous rocks.