Text-Book of Zoology (Classic Reprint)

On the dorsal side of the vertebral column lies the central nervous system (brain and spinal cord) ;on the ventral side lie the organs of respiration, circulation and digestion. Usually four limbs, rarely two or none. 1. Plan of Structure. All vertebrate animals are obliged to go in search of their food, and that for the most part over an extensive range. Consequently they must be endowed with the means of free locomotion. (C ontrast them in this respect with plants and many animal parasites.) H.I LONGITUDINAL SECTION THROUGH THE BODY OF A VERTEBRATE (DIAGRAMMATIC). W., Vertebral column ;R.m., spinal marrow ;G., brain ;S.n., optic nerve ;R. n., olfactory nerve, ramifying within the nasal cavities; Z., tongue; Sp., oesophagus Ma., stomach ;D., intestine ;L., liver ;B.dr., pancreas ;M i., spleen ;L r., trachea ;L u. lung; H., heart, with several bloodvessels; Zw., diaphragm; N., kidney; H.I., ureter H.b., urinary bladder. The smaller the resistance encountered by a creature in its progress through the air, the water, or on the earth, the more rapidly it can move, and the more easily is it able to obtain its food.
(Typographical errors above are due to OCR software and don't occur in the book.)

About the Publisher

Forgotten Books is a publisher of historical writings, such as: Philosophy, Classics, Science, Religion, History, Folklore and Mythology.

Forgotten Books' Classic Reprint Series utilizes the latest technology to regenerate facsimiles of historically important writings. Careful attention has been made to accurately preserve the original format of each page whilst digitally enhancing the aged text. Read books online for free at www.forgottenbooks.org