THE MICROSCOPE. 169 
lymphoid cells, also the lung-epithelia and particles of mucous, 
were laden with the inhaled dust; moreover, free dust was 
found in the lumen of the alveoli as well as in that of the bronchiz. 
On the other hand, the ecylindrical-epithelial calls of the bronchie 
were entirely free from dust. Further, Slavjansky pointed out, in 
rabbits, three days having elapsed after the inhalation of cinnabar, 
cells containing coloring materials in the cortical layers of the 
lymphatic glands situated at the base of the lung. From all these 
researches, it has been concluded that the dust (cinnabar, coal, etc.) 
inhaled under artificial or natural conditions, is driven into the 
distant extremities of the breathing canals, there received by the 
cellular elements, lymphoid and mucous cells, perhaps also by the 
flat and transparent epithelium which, lining the alveoli and these 
cells, are then either absorbed by the lymph-canaliculi, or are 
conveyed into the lymphatic vessels. (Klein.) From the small 
lymph-canaliculi they are led into the lymphatic vessels, and thence 
into the lymphatic glands situated at the base, and deposited. 
Concerning the consequences of this depositation in the 
lymphatic glands, Roth writes in the “ Correspondenzblatt fiir dié 
Schweizer Aerzte,” Jahrgang XIV, 1884, as follows: “‘ The changes 
vary according to the degree of coloration of the lymphatic glands; 
if it is but trifling, it may be endured without further disturbances; 
but if considerable, local inflammation, lymph-adenitis and peri- 
lymph-adenitis chronica may set in. In consequence of the latter, 
on the one hand, a development of cicatricial tissue, a common slaty 
induration of the tracheal and bronchial lymphatic glands, and° 
further, a shrivelling and a destruction of the lymphatic structure, 
may result; on the other hand, the process may become acute, and 
soon abscesses of the lymphatic glands, with suppuration of the 
capsule and the neighboring tissue, may result. The process may 
also spread to the neighboring organs, as the bronchie, veins, 
arteries, heart or pericardium, which may lead to fatal results. Or 
the former slaty, indurated mass may soften, slough and become a 
slaty pulp, which microscopically and chemically presents nothing 
else than anthracotic pigment in a free state, or deposited in lym- 
phoid cells; also cells of fatty degeneration, cholesterinic clots of 
necrotic tissue, at times also leucin and tyrosin, occasionally even 
lime. To the united product one might, in my opinion, give the 
name “slaty cheese.” 
Should the process take a chronic course, it is not seldom found 
in dissecting that the more or less enlarged, slaty, indurated 
lymphatic glands, on being cut into, present a striped appear- 
