Pericardio'Peritoneal Canals 455 



Blood Vascular System 457 



The Heart 457 



The Blood Vessels 461 



The Arteries 461 



The Veins 471 



The Nervous System 472 



The Brain 473 



The Cranl-^l Nerves 475 



The Spinal Nerves 485 



The Sense Organs 487 



The Membranous Labyrinth 487 



The Sensory Canal System 489 



Discussion 492 



Bibliography 498 



334 



