This affection--technically known as _phthisis pulmonalis_--is the
termination of chronic disease of the lungs. These organs become filled
with many little cysts, or sacks, containing a yellowish or
yellowish-white fluid, which in time is hardened, producing a condition
of the lungs known as tuberculous. These tubercles in turn undergo
another change, becoming soft in the centre and gradually involving the
whole of the hardened parts, which, uniting with adjoining ones, soon
forms cysts of considerable size. These cysts are known as abscesses.
No treatment will be of much service here. It is, therefore, better, if
the animal is not too poor in flesh, to have it slaughtered.