PHYSIOLOGY. 13 



Absorption of the Chyle,. 



The chyle being absorbed from the internal surface of the 

 small intestines by the lacteals, is carried into the receptacu- 

 lum chyli, and thence by the thoracic duct into the left sub- 

 clavian vein, which itself opens into the upper vena cava. 

 Here the organs are the lacteals, the receptaculum chyli, and 

 the thoracic duct. 



FUNCTIONS OF RELATION. 



The animal places itself in relation with exterior objects 

 by means of two grand apparatus the apparatus of sensations 

 and the apparatus of movements. The first of these regards 

 the faculty termed sensation, the second the faculty called 

 locomotion. 



THE NERVOUS SYSTEM 



Is formed of a peculiar substance soft and pulpy, nearly 

 fluid in the early period of life, and acquiring more consis- 

 tence as the animal is developed. This substance, either 

 gray or white, constitutes masses more or less considerable, 

 or cords more or less ramified. 



The Nervo-Cerebral System, 



Or that of animal life, (PI. 3, fig. B) includes the encepha- 

 lum and the nerves. 



The Encepiialum. (PI. 2, fig. A.) 



Under the head of encephalum we speak of the cerebrum 

 (n), the cerebellum (r), and the medulla oblongata (m, m, m). 



The Cerebrum 



Is a large pulpy ovoid organ, with the thickest extremity 

 behind. It is composed of two substances ; one white and 

 internal, the other gray and usually external; including ca- 

 vities termed ventricles, and lodged in a bony case called the 

 skull. It is the centre of perception. It is divided into two 

 hemispheres, of which each consists of an anterior, a middle 

 and a posterior lobe. 



The Cerebellum. 



A nervous mass in the hinder part of the skull; gray with- 

 out, white within ; presenting outwardly the appearance of 

 layers folding one over the other. 



