ON TUBERCLES IN DIFFERENT ORGANS. 717 
fallen a victim to this fearful malady, they have been found 
disorganised to such an extent, that there scarcely remained a 
particle capable of accomplishing the respiratory function ; or, 
if a part of the tissue remained somewhat healthy, it was so 
compressed and indurated, that it was no longer susceptible of re- 
ceiving air into its vesicles. Indeed, it is evident that many 
phthisical patients cannot be said to breathe by the lungs for some 
time before they die. How is it, then, that they do not die from 
asphyxia] or what is the organ that assumes the place and 
function of the pulmonary apparatus] This is a problem difficult 
to solve. 
The interior of tuberculous cavities is generally traveTsed by 
bands attached at both extremities to the sides of the cavity. 
These bands are usually composed of pulmonary tissue in a 
state of induration, and bloodvessels transformed into imper- 
meable fibrous cords. In some cases, however, the vessels 
continue permeable, and, by their rupture, occasionally give 
rise to attacks of haemoptysis. The substance of the lung 
around the cavities is sometimes healthy, sometimes filled with 
tubercles in different stages, and sometimes indurated, and of a 
grey or black colour. The walls of these cavities are generally 
formed by the parenchyma of the lung, either naked, or covered 
by the most concrete part of the purulent matter contained in the 
cavity. 
The matter contained in tuberculous cavities is commonly a 
white or grey purulent fluid, in which are suspended numerous 
cheesy particles resembling the debris of tubercles. In other cases 
there is pus variable in colour and consistency; or blood both 
fluid or coagulated ; or fragments of the pulmonary parenchyma 
floating loose ; or calculous concretions loose and unattached. The 
selector of these passages has seen in the quadruped all these 
morbid appearances. 
Tubercles are not often found in the liver. There is inflam- 
mation running on to decomposition. There is also fatty dege- 
neration, but seldom tubercles. In the spleen they are frequent, 
but have been rarely or never seen in the pancreas. They have 
occupied the Fallopian tubes, and they have been met with in the 
testicles. They have been found in the muscular tissue and in 
the tissue of the bones, corroding and perforating them by the 
mechanical pressure which they exercise. They develop them- 
selves in the very centre of the bone, and are surrounded every 
where by healthy osseous tissue. Finally, these tubercles have 
been found in the iliac veins, in the vena cava, and swimming in 
the venous blood in various parts. 
Having thus studied tuberculization in almost every organ and 
every tissue, M. Lugot next proceeds to the important question, 
What is its cause ] Here pathologists are much at variance. 
VOL. XIV. 5 B 
