THE MICROSCOPE. 235 
Case I: By Post Mortem Examination.—Hemorrhagic pleuritis, 
thrombosis of the pulmonary artery in connection with the sur- 
rounding gangrene. 
The lungs are strongly affected with anthracotic pigmentation; 
_the quantity of blood and air in them being diminished. The right 
lung is affected with senile atrophy and shows some vesicular emphy- 
sema; circumscribed slaty indurations are not apparent. On the 
contrary the lower lobe of the left lung is compressed to a great ex- 
tent by a hemorrhagic exudation. The tracheal and bronchial 
lymphatic glands at the hilus (base of the lung) are very large 
and slaty, a few of them being of very solid consistence. Some of 
the same are adherent to the bronchi and blood vessels near 
which they lie. A shrunken, black gland lies close to the right 
principal bronchus, and has grown fast to it. An incision being 
made, a small opening was found, which led into the interior of 
the gland. A second enlarged, slaty, indurated, lymphatic gland 
lies close to the principal branch of the pulmonary artery, and is 
firmly adherent to it. The lumen of the artery is narrowed at that 
point where the black, solid gland lies, and the wall itself is consid- 
erably pigmented by anthracotic pigment. On opening the artery 
an autochthonal thrombus is found, which obviously came into 
existence through the contraction and the defect in the endothelium. 
The thrombus gave rise to the surrounding gangrene. A deposit of 
anthracotic pigment is found in the liver and spleen. 
Case II: P. M. Exam.—A well developed primary cancer of 
the gall bladder, with regional metastases in the liver and mesen- 
teric lymphatic glands. 
Both lungs are strongly affected with anthracotic pigment; no 
particular indurations were present. The right lung shows 
croupous pneumonia, to which the patient succumbed. The left 
lung is, on the contrary, abundantly supplied with blood, but its 
capacity for air is greatly increased. The bronchial lymphatic 
glands at the base are very large, indurated and slaty. One of 
them especially is very black and shrunken; lies close to the princi- 
pal branch of the vena-pulmonalis, and is adherent to it. The wall 
of the vein is completely penetrated at the junction by black 
(anthracotic) pigment, which chemically and microscopically corres- 
ponds with the inhaled coal-dust of the lungs, and the tracheal and 
bronchial lymphatic giands. An incision into the vein shows a 
small opening leading into the interior of the black lymphatic 
gland. In the liver and spleen is found a large deposit of pigment, 
especially of two kinds—a brown and a black one. Macroscopically 
