Xll CONTENTS. 



PAGE 



3. The Kidneys. Secretion of Urine, ........ 490 



Structure and Actions of the Kidneys, ....... 490 



Composition and Sources of Urine, ........ 497 



4. The Skin. Cutaneous Transpiration, ........ 520 



Structure of Sudoriparous Glandulse, ....... 521 



Sudoriparous Excretion, .......... 521 



CHAPTER XII. 



OF THE EVOLUTION OF HEAT, LIGHT, AND ELECTRICITY. 



1. General Considerations, . 527 



2. Evolution of Heat, ... 928 



Temperature of the Human Body, 529 



Sources of Calorifying Power, . 541 



Absolute amount of Heat produced in the Body, ..... 542 



3. Evolution of Light, 549 



4. Evolution of Electricity, 550 



CHAPTER XIII. 



ON THE FUNCTIONS OF THE CEREBRO-SPINAL NERVOUS SYSTEM. 



1. General Summary, 553 



Structure of the Nervous System, 558 



Regeneration and Chemistry of Nervous Tissue, ..... 553 



Cerebro-Spinal Nervous Centres, 565 



Cerebro-Spinal Nerve-Trunks, ......... 571 



Determination of the Functions of Nerves, 574 



Rapidity of Transmission of Motor and Sensory Impressions, . . 581 



Electrical Currents in Nerves, 583 



Electrotonus, ............ 585 



Law of Muscular Contraction, ......... 590 



2. Of the Spinal Axis (Spinal Cord and Medulla Oblongata), .... 597 



Structure and Relations of the Spinal Cord, ...... 597 



Nerves of the Spinal Axis, ......... 601 



Structure and Relations of the Medulla Oblongata, ..... 605 



Deep Origin of Spinal Nerves, 608 



The Spinal Cord as a Conductor of Sensory Impressions and Motor Im- 

 pulses, ............. 627 



The Spinal Cord as an Independent 1 Centre, 633 



3. Of the Sensory Ganglia, 649 



Structure and Relations of the Sensory Ganglia, ..... 649 



Nerves of Special Sensation, 651 



Nerves of Common Sensation, ......... 655 



Functions of the Sensory Ganglia: Sensori-Motor Actions, . . . 656 



Muscular Sense, ........... 608 



4. Of the Cerebellum, ... 673 



Structure and Relations of the Cerebellum, ...... 674 



Functions of the Cerebellum. Co-ordination of Muscular Action, . 675 



Supposed Relation to Sexual Propensity, 680 



5. Of the Cerebrum, 685 



Structure and Relations of the Cerebrum, ...... 686 



Functions of the Cerebrum. Intelligence as contrasted with Instinct, . 695 



