VI PREFACE. 



As Anatomy teaches us the Structure of an Organized Body, 

 Organic Chemistry, its Chemical constitution, and Physics, its 

 Physical Properties, so Physiology instructs us in the Physical, 

 Chemical, and Vital actions which occur in it, during Life. The 

 last-named science therefore requires a certain acquaintance with 

 the others. 



The following Outlines of Physiology, accordingly, commence 

 with a short description of the Human Body, its Cavities, and the 

 Organs which they contain. It is then shown how a beginner in 

 Physiological studies may be assisted in this part of the subject 

 by the Dissection of an Animal. 



Attention is next drawn to the Textures or Tissues of which 

 the several parts or Organs of the body are composed. The tongue 

 and larjmx of the sheep are selected as convenient parts, to illus- 

 trate the General characters, Connections, and Uses of these Tis- 

 sues. The Microscopic Structure of the Tissues in the Human 

 Body is then described ; and afterwards, their Physical properties 

 and Chemical constitution. 



Under the head of General Physiology, an account is given of 

 the Vital Properties of the Tissues, and a general outline of the 

 Functions of the living Animal Body. 



The relations of Man with External Mature are next consid- 

 ered, including a sketch of the Animal Kingdom to which Man 

 belongs, and of the Types and Laws of Form which it presents. 

 To this is added a comparison of the Animal with the Vegetable 

 Kingdom, and of both those Organic Kingdoms with the Inor- 

 ganic Kingdom. 



The Special Physiology of the several Animal Functions is 

 then examined in detail, commencing with those of Animal Life, 

 in the following order : 



Animal Motion ; Movements generally ; Animal Mechanics ; 

 Locomotion on solids, in fluids, and in air ; Prehension ; Manipu- 

 lation ; Gesture ; Voice, and Speech. 



Sensation, the Regulation of Movement, and the Psychical Func- 

 tions, or the Functions of the Nervous System. Treated as special 

 subjects under this head, are Sensation generally, and its Modifi- 

 cations ; viz., the Internal Sensations, such as Hunger, Thirst, 



