178 M R. youatt’s vetkrixary lectures. 
what is the matter, and the uniform fatality of the complaint; 
and he either slaughters the animal at once, or suffers him to 
take his chance, and rarely or never requires the veterinarian’s 
aid. The beast at length dies; and the whole of the bronchial 
passages are found to be completely choked up with worms. 
They are of the strongfjlus species, and either the Jilaridj or the 
veiiiiilosuSf but chiefly the former. Many of them are also found 
in the trachea; and the mucous membrane of the trachea and 
bronchi presents an appearance of the intensest inflammation, 
and by which the animal was destroyed. 
The generation of these parasitical animals will be best dis¬ 
cussed when we come to the consideration of the different entozoa 
of the intestinal canal. In the human being worms are oftenest 
found in an injurious quantity in a cold and moist state of the 
atmosphere, or in moist situations and especially in those that 
are covered with the vegetable productions peculiar to such a 
locality: also in young subjects, and where the constitution is 
somewhat enfeebled. We have all these predisposing causes 
here; and yet the generation of these animals, and the mode by 
which they are introduced into the system, are perfect mysteries. 
Whether they are the cause or effect;—whether, amidst the. 
vitiated secretion of the inflamed mucous membrane of the bron¬ 
chi, the ova find their proper and destined nidus, and are there 
hatched into life ; —or the membrane is irritated and inflamed by 
the presence of these parasites, deposited ere the part was dis¬ 
eased, are subjects that will be better illustrated hereafter. In 
point of fact, they are found to occupy tlie whole of the bronchi, 
and by the irritation which they produce they destroy the beast. 
Treatment .—The question that most concerns us now, is the 
mode by which they are to be got rid of. Nothing can be 
brought to bear upon them immediately. No turpentine or other 
fluid destructive to worms can be introduced into the bronchial 
tubes. Can any deleterious gas be employed ? Can it be in¬ 
troduced into the system in a quantity not sufficient to injure 
the beast, yet with the chance of destroying these vermin ? 
Might pieces of tow, impregnated with a solution of chlorine, 
be spread over the trachea, and particularly the lower part of 
it ? Or might the animal be shut into a close place, and made 
to breathe diluted chlorine gas, or nitrous acid gas ? A portion 
of it would pass the watchful sentinels in the nasal cavities and 
at the entrance into the larynx, and possibly enough to effect the 
desired purpose. The animal would be not a little annoyed ; he 
would for awhile cough with even greater violence, when the 
worms dying, or their hold loosened, they might be expelled. This 
is really worth trying,^^ and should you succeed, gentlemen, you 
