TRACHITIS. 



lectures, making mention of a case coming under his 

 observation, in which a slight opening existed at the upper 

 part of the trachea, or lower part of the larynx, in conse- 

 quence of which, during expiration, the air escaped through 

 the opening into the areolar tissue and caused great dis- 

 tension of the part, which, however, did not persist for any 

 great length of time, the swelling subsiding in consequence 

 of absorption of the air taking place, when the presence of 

 the opening into the trachea could by means of the fingers 

 be plainly distinguished through the intervening soft tissues. 



Treatment. — An incision should be made, cutting well 

 down through the soft tissues until the abnormal opening 

 lies fully exposed, after which a counter-irritant should be 

 applied, and of a strength great enough to cause the exuda- 

 tion of material sufficient in quantity to close the opening. 



Enlargements over the course of the trachea are some- 

 times met with, occurring with greatest frequency amongst 

 colts. 



Treatment consists in the free application of counter- 

 irritants, preferably such as contain iodine. 



Thickening of the mucous membrane lining the trachea, 

 constituting a chronic or simple inflammation of the trachea, 

 sometimes occurs, giving rise to more or less difficult 

 respiration, and perhaps a slight discharge from the nostrils. 



Treatment consists in the application of counter-irritants 

 over the course of the trachea, the ungt. hydrarg. biniod. and 

 the ordinary ungt. iodi being useful, in conjunction with the 

 administration internally of potassium iodide, nitrates, etc. 



THE LUNGS 



Are those two spongy organs, one on either side, situated 

 in the thoracic cavity, and are the essential organs of respira- 

 tion, and are composed of : first, the pleura, then the sub- 

 serous tissue, then the parenchyma, or lung substance proper. 



