106 



GENERAL ANALYSIS. 



384. A LUNG is an exceedingly simple organ in its 

 ideal or plan state. 



385. A EEAL LUNG is merely an aggregate of cells 

 such as just described, the whole being covered in by a 

 skin or membrane, called Pleura. 



FIG. 94, 



Fig. 94, plan of a very high- 

 ly magnified cluster of air-cells, 

 c, into which a allows the air 

 to enter. 



Fig. 95 represents the wind- 

 pipe dividing into two branch- 

 es, each of which subdivides in 

 its corresponding lung, much 

 I more minutely than represent- 

 ed, and opens into clusters of 

 1 cells, like Fig. 94. 1, 2, 3, a 

 FIG. 95. continuous membrane, forming 

 surface of lungs. 



884. What ? 8S5. What is-? Describe Fig. 94. Fig. 95. Can the enlarge- 

 ment 5 be felt? What its usual name ? 



