COUGH, OR CATARRH. 391 



In violent colds the inflammation of the 

 membranes is often very considerable, so as 

 to render swallowing painful and difficult, and 

 cause a rattling in tlie head as it is termed ; 

 that is, from the increased secretion of mucus 

 within the nostrils, or from swellinijj of the 

 membranes which lines them, the air is in- 

 terrupted in its passage, causing a peculiar 

 sound in breathing. In some cases the in- 

 flammation extends to the branches of the 

 windpipe, in consequence of which many of 

 the finer branches are either partially or wholly 

 plugged up by the coagulable lymph whicii 

 is poured out. Sometimes there is so much 

 coagulable lymph poured out in the windpipe 

 as to render respiration difficult, and cause 

 that sonorous breathing, which is technically 

 named roaring. When some of the branches 

 of the windpipe are plugged up w ith coagu- 

 lated lymph, it causes also quickness of 

 breathing;' for. the lungs being now unable 

 to contain so much air as they did before, the 

 animal is obliged to inspire more frequently to 



fected with catarrh, is rather of an acrid or stimulating nature, 

 fiom being loaded with saline matter : this indeed is sometimes 

 so considerable, as to inflame the skin of the lip over which it 

 passes. This happens also sometimes in diseases of the eye, 

 wlierc the tears or water from the eye are so acrid, as to inflame 

 the skin of the nose which it flows over. 



