What is true of the analogies that exist between the two kingdoms of life is also true of those that we find in each kingdom by itself. I have therefore, in this Part, traced the resemblances which the contrivances in the human system bear to those which we see in animals of different kinds, and also the differences, giving to some extent the reasons for them—that is, I have made it in some measure a book of comparative physiology. The effect of this mode of treating the subject will be to interest the child’s mind in the observation of the various animals, great and small, that he sees from day to day. Natural History, which is otherwise rather a dull study, will thus become very attractive to him. And, to further this object, which I deem to be of great importance, I have noticed the habits of some animals in such a manner as to connect distinctly Physiology with Natural History, a relation which, though an obvious one, has very generally been disregarded.
While I have aimed in this Part at the same kind of simplicity as in the First, there are some points in it which require a greater compass of mind to understand. This is as it should be; for in going through the First Part there will, of course, be acquired by the learner some amount of skill in observation and reasoning. I have taken special care, however, not to presume too much upon the mental advance thus made.
Worthington Hooker.
CONTENTS.
| CHAPTER | PAGE | |
| I. | WHAT IS MADE FROM THE BLOOD | [2007] |
| II. | MORE ABOUT WHAT IS MADE FROM THE BLOOD | [2010] |
| III. | HOW THE BLOOD IS MADE | [2013] |
| IV. | MOTHER EARTH | [2015] |
| V. | THE STOMACH AND THE TEETH | [2019] |
| VI. | MORE ABOUT THE TEETH | [2022] |
| VII. | THE CIRCULATION OF THE BLOOD | [2026] |
| VIII. | BREATHING | [2030] |
| IX. | BRAIN AND NERVES | [2034] |
| X. | HOW THE MIND GETS KNOWLEDGE | [2040] |
| XI. | SEEING | [2047] |
| XII. | HOW THE EYE IS GUARDED | [2052] |
| XIII. | HEARING | [2057] |
| XIV. | THE SMELL, THE TASTE, AND THE TOUCH | [2063] |
| XV. | THE BONES | [2068] |
| XVI. | MORE ABOUT THE BONES | [2072] |
| XVII. | THE MUSCLES | [2077] |
| XVIII. | MORE ABOUT THE MUSCLES | [2082] |
| XIX. | THE BRAIN AND NERVES IN ANIMALS | [2087] |
| XX. | THE VARIETY OF MACHINERY IN ANIMALS | [2091] |
| XXI. | THE HAND | [2096] |
| XXII. | WHAT ANIMALS USE FOR HANDS | [2102] |
| XXIII. | THE TOOLS OF ANIMALS | [2109] |
| XXIV. | MORE ABOUT THE TOOLS OF ANIMALS | [2115] |
| XXV. | INSTRUMENTS OF DEFENSE AND ATTACK | [2122] |
| XXVI. | WINGS | [2131] |
| XXVII. | COVERINGS OF ANIMALS | [2138] |
| XXVIII. | BEAUTY OF THE COVERINGS OF ANIMALS | [2142] |
| XXIX. | HOW MAN IS SUPERIOR TO ANIMALS | [2148] |
| XXX. | THE THINKING OF ANIMALS | [2153] |
| XXXI. | MORE ABOUT THE THINKING OF ANIMALS | [2157] |
| XXXII. | WHAT SLEEP IS FOR | [2162] |
CHAPTER I.
WHAT IS MADE FROM THE BLOOD.
The blood the building material of the body.