MelaislemiA. 
£93 
the entrance of the chest and on the bronchial ganglions. The 
lymphatic glands generally become easily the seat of pigmentary 
infiltration, specially if situated near a melanotic tumor. The 
lungs contain them also, but they are more rare and principally 
metastatic. Mandel has seen a horse in which three quarters 
of a lung were filled with a large and heavy bunch of melanotic 
growths. When the lungs are thus affected, the heart presents 
them also and the pericardium is often covered with little per- 
dunculated masses of small size. 
The nervous system is not exempt. The base of the brain, 
its envelops and even the nerves themselves may contain them. 
Bruckmuller cites a case where they produced paralysis. In the 
eye, the sclerotic, the choroid and the retina have also presented 
melanotic tumors. 
At last the bones, the muscles, the parotic glands, the thyroid 
bodies may also be found the seat of a pigmentary infiltration. 
Melanosis is generally slow and mild in its development; 
and though it seldom kills an animal, it is not without danger. 
Animals thus affected lose much of their value. They may still 
live long, though it is generally admitted that their life of useful¬ 
ness is short. It is generally only by the excessive size they may 
reach or by their number, that they become injurious; or by be¬ 
coming soft and ulcerated. 
If, however, in general* the presence of melanosis is compat¬ 
ible with healthy condition, they may become dangerous by giving 
rise to serious phenomena. They may interfere with the execu¬ 
tion of a function. Near the anus, they may prevent defecation; 
at the penis, interfere with micturation. Olivier mentions a case 
where a tumor was pressing against the sesophagus, and from 
which food, liquid and solid, was stopped in its way to the stom¬ 
ach. Cases are recorded, where, by pressing against blood vessels 
and nerves, they gave rise to rebel sedema of the extremities and 
to paralysis. Pauleau has seen it pressing upon the pneumo-gas- 
tric, and, as consequence, the animal was a roarer. They may 
interfere with the motion of a joint, or produce the complete 
dislocation of the globe of the eye. Developed, as they are in 
*Darboval Dictionary by Zundel. 
