220 A COLD — WHAT ? [BOOK II. 



Mix, for one extensive application over each side 

 of the chest ; which is a neater and more expedi- 

 tious method of attaining the desired end than seton 

 or rowel. When the latter method is adopted, 

 let the tow used for the rowel be dipped in a 

 mixture of sweet oil and oil of turpentine ; and the 

 skin of the breast or belly, — if more than one such 

 seton is employed — be separated only just suffi- 

 cient to admit the rowel, in order to increase the 

 irritation ; but if the surrounding parts swell to an 

 extraordinary size, change the tow for some which 

 3 been sodden in digestive ointment. 



A COLD or CATARRH. 



Causes. — If we sought much nicety of arrange- 

 ment, the disorder termed " a cold," would have 

 preceded the similar but more malignant attack de- 

 scribed under " Inflammation of the Lungs." Both 

 are occasioned by cold applied to the animal's or- 

 gans of respiration at a time that he is most sus- 

 ceptible of its influence, differing only in the part 

 which may suffer. Thus, when the canal through 

 which the air passes receives the check which is the 

 i mmediate cause of inflammation, every one agrees 

 in its being merely " a cold," though in most cases 

 no attack is more replete with danger, if neglected. 



But the origin and progress of such a check upon 

 the functions of the membrane that lines this canal, 

 having been already fully described in the second 

 chapter, pages 101 and 104, the studious reader 

 must turn back to that part, if he would trace causes 



