236 THE MICROSCOPE. 
only a brown pigment can be seen, which, under the microscope, was 
found to be strongly ferrugious (consisting of chemically hydrated 
sesquioxide of iron.) Microscopically the black (anthracotic) 
pigment could be seen, which lies deposited along the smaller 
arteries (perivascular), and in the outer zone of the malpighian 
bodies. See Fig. 1-2, Plate IX. In the liver |the black pigment 
was deposited not only within the glisson-capsule, but also in the 
tissue cells along the vena centralis. (Figs. 38 and 4, Plate X.) 
There was no anthracotic pigment in the kidneys; merely ferrugious 
(iron pigment). 
Casn ITI.—EHmbolism of the pulmonary arteries, and a simulta- 
neous slaty and brown induration of the lungs. 
Anthracotic pigmentation of the lungs marked; the capac- 
ity of both lungs for blood is greater than normal, that for air 
less. The edges of both lungs are slaty; the lower lobes, on the 
contrary, are indurated and quite brown. Infarctions or softenings 
are not apparent. The bronchi are somewhat dilated, but there 
are no cavities. The tracheal and bronchial lymphatic glands 
at the base are enlarged, solid and slaty, a few of them being quite 
adherent to the neighboring bronchi and pulmonary arteries, the walls 
of which are more or less infiltrated with coal pigment. An incision 
into the right principal bronchus shows a radiated cicatrix, in whose 
center there is a small opening which communicates with the exist- 
ing cavity in the interior of this black gland. A second lymphatic 
gland lying close to the left principal bronchus is calcified in toto 
with its capsule, and this mass has perforated the wall of the 
bronchus, and still clings rather closely to it. (Recklinghausen.) 
The liver and the spleen show a condition of cyanotic atrophy, 
and a deposit of anthracotic pigment. 
Case IV.—EHaxquisite slaty induration of both lungs. 
Anthracotic pigmentation is great; both lungs are highly 
marbled with slaty indurated cicatrices; the capacity for blood is 
rather increased, on the contrary that for air is diminished ; the 
formation of cavities, or softening, are not present. The tracheal 
and bronchial lymphatic glands at the base are very large, indurated 
and slaty ; one of the same is shrunken and entirely black, and lies 
close to the principal branch of the vena pulmonalis, and is adherent 
to it. At the point of junction the wall is considerably infiltrated 
with anthracotic pigment. An incision into the vena pulmonalis 
discloses at the place of the junction with shrunken black 
gland, a diverticulum, producing a traction-varix, evidently the 
product of chronic inflammation (Lymphadenitis and Periaden- 
