DESCRIPTION OF PLATES. 



PLATE I. 



Fig. 1. — Lungs of Guinea-pig, containing tubercles, grey and semi-transparent at the margins, and in 

 some places slightly opaque in their centres. 



Fig. 2. — Enlarged Spleen of Guinea-pig, showing scattered grey granulations, which in some places 

 are agglomerated into groups; in other parts, groups of granulations are seen of opaque 

 yellow colour. 



Fig. 3. — Portion of another Spleen when the granulations are larger and more scattered. 



Fig. 4. — Liver of Guinea-pig, showing large tracts infiltrated with grey granulations, passing in many 

 places into a more opaque yellow condition. Larger and more isolated opaque whitish 

 spots are also seen scattered through the tissue. 



Fig. 5. — Axillary Lymphatics of Guinea-pig, showing cheesy spots. 



Fig. 6. — Subcutaneous Granulations and Cheesy Masses near seat of injury, in rabbit inoculated with 

 tubercle. (These were identical in appearance with those described in the guinea-pig.) 

 The masses are seen to be composed of agglomerated granulations. Smaller groups of these 

 are seen at variable distances from the larger masses. These latter are greyer and less 

 cheesy than the larger masses. 



Fig. 7. — A Cord of Indurated Tissue, partly cheesy, extending between a lymphatic gland and a cheesy 

 granulation. (Guinea-pig.) 



Fig. 8. — Lobular Pneumonia in a Eabbit, the subject of Laryngo-tracheitis. The infiltration of the 

 pulmonary air-vesicles forms a marked contrast to the granulations in the rabbit. 



Figs. 9, 10. — Lungs of Eabbit with Pyajmic Spots, contrasting with the granulations in the guinea-pig. 



PLATE II. 



Fig. 1. A, B. — Tubercular Growth in Sheath of Bronchi. (Guinea-pig.) 



.4 X 460 diam. shows (a a a) section of bronchial tube at point of bifurcation. The upper 

 part is marked by elastic fibres ; the lower, by cartilage cells, hhh represents the growth 

 of tubercle in its sheath, which is seen to be proceeding by a multiplication of cells and 

 nuclei, partly round, partly ovate and fusiform. These, at a little distance, are passing into 

 the walls of the alveoli, which are thickened by the growth ; the outlines of the alveoli 

 being still maintained. A few enlarged epithelial cells are seen within the alveolL The 

 vessels of the alveoli so implicated are for the most part obUterated. 



.B X 700 diam. From lower part of A. (a) Sheath of bronchus, (b) Growth of tubercle 

 by round and ovoid cells, (c) Epithelium enlarged and separating, (d) A growth of 

 fusiform cells which also are seen passing in strings and rows between the capillaries ; 

 of which a good example is observed at (e). 



Fig. 2. — Growth of Tubercle in Perivascidar Sheath of Pulmonary Artery. X 460 diam. (reduced). 



(Guinea-pig.) 

 (a a). An artery at a point of bifurcation, the section being carried obliquely through the 



plane of both branches. 

 (li b). Multiplication of cells in the sheath, external to the muscular coat. In both branches 



a dense agglomeration of these cells is seen in some parts, marked in one branch by (c). 



The growth is seen extending into the walls of the surrounding air- vesicles, the capillaries 



of which are impervious to injection. 

 (tl). Enlarged and pigmented epithelial cell. 



