IRISH CENTRAL VETERINARY MEDICAL ASSOCIATION. 689 
during the night. Considering this a case worth investigating, I 
got the horse under my own care for three months; during the 
time I treated him for chronic bronchitis, and I was successful so 
far as to remove the principal symptoms, and render the horse fit 
for ordinary harness work. However, I am convinced that dilation 
of the bronchi has taken place, from the symptoms which still 
remain. He continues to give a few short coughs on leaving the 
stable, his respirations are deeper, and after exercise his nostrils 
dilate more than natural; but if his stomach is empty he can go 
any distance without symptoms of distress or inconvenience. 
I had another case from almost the same cause, but wdth a 
different result, which I consider is interesting enough to introduce 
here also. The patient was a very valuable hunter, and was ex¬ 
posed in a similar way to the effects of smoke in a burning stable, 
and all the symptoms of acute bronchitis followed ; but with re¬ 
peated blistering and other treatment, the horse became, to all 
appearance, sound, with the exception of a cough which remained. 
Some time after, and when beginning to get into condition, his 
owner’s groom gave him a short gallop; he scarcely went a quarter 
of a mile when he heard a peculiar snore, as if from difficulty of 
breathing, and in another moment he staggered and almost fell 
forward; the man was immediately off his back, and to his head, 
when he found him bleeding very slightly from the right nostril, 
but suffering intense dyspnoea. He was led quietly back to his 
stable; the bleeding stopped, and by a couple of hours he was 
quite himself again. The blood was distinctly arterial, and I think 
came from the capillaries of the bronchial tubes, or perhaps from 
the air cells. This horse was blistered several times, had six months 
perfect rest, with an occasional dose of physic ; and he came so far 
round that he could go any distance. The cough, however, con¬ 
tinued, but for a year afterwards occasionally a slight trace of blood 
could be detected mixed with the mucus of the nose or froth after 
a gallop. Why smoke should produce such effects it is somewhat 
difficult to say, but it must cause dilation, and perhaps derangement 
of the air-cells themselves. 
The third sequel of chronic bronchitis is complete stoppage or 
blocking-up of the tubes, with collapse of one or more of the lobules, 
and “thick wind ” as a consequence. 
There are other causes of “thick wind,” but I look on this to be 
amongst the principal ones. The production of this, I consider, 
depends on the excessive secretion of mucus from the bronchi, 
which renders the ciliated epithelium so weak and debilitated as to 
make their development imperfect; and the important part which 
they play in connection with the muscular fibres of the tubes be¬ 
comes either completely destroyed or, at least, impaired, and the 
secretion block up as the result. This usually occurs in the second 
or third bronchi, and oftenest at a junction ; collapse of the lobule 
behind it follows, when it ceases to have any effect in performing 
the process of respiration. I have myself seen collapse of the 
border or edge of a lung, from blocking of the air tubes in acute 
