X CONTENTS. 



CONVERSATION V. 



Respiration the lungs the thorax mechanism ot inspira- 

 tionchanges wrought upon the air, by respiration relation 

 of these changes, to changes wrought upon the blood animal 

 heat respiration of Fishes of Birds of Reptiles of Mollusca 

 and Insects of Spiders. Secretion various kinds of secre- 

 tions secretion of the inferior animals. Absorption perfor- 

 med chiefly by the veins the lymphatics the lymph nu- 

 trition 99 



CONVERSATION VI. 



Nervous system. Its progressive developement, in the inferior 

 animals the spinal marrow nerves brain functions of the 

 nervous system - sensation volition Mr. Bell's discovery- 

 theories of the nervous power Dr. Wilson Philips' experi- 

 ments phrenology comparison between the brain of man 

 and that of inferior animals facial angle instinct reason. . . 128 



CONVERSATION VII. 



The senses- the eye eyebrows eyelidseye-lashes tears 

 sclerotic coat choroid cornea iris aqueous humor crys- 

 talline lens retina modification of the rays, by the coats and 

 humors short-sightedness motions of the eyes squinting 

 vision, assisted by the other senses vision of Birds of Fish- 

 es of Insects. Hearing sound anatomy of the ear hearing 

 assisted by the other senses hearing of the inferior animals. 

 Smelling use of the sense of smell smelling; of the inferior 

 animals. Taste influence of civilization upon taste taste of 

 the inferior animals. The touch integuments human com- 

 plexion albinos. The voice larynx larynx of the inferior 

 animals cries language singing ventriloquism voice of 

 Birds 153 



CONVERSATION VIII. 



Locomotive organs bones composition of bone ossification 

 nutrition and reparation of bone joints skeleton skele- 

 ton of the lower animals adaptation of the human skeleton to 

 the erect position human foot and hand the muscles at- 

 tachment of the muscles to the bones action of the muscles 



