viii DESCRIPTION OF PLATES. 



Fig. 3. — Transverse Section of a Pulmonary Artery, surrounded by a growth of Tubercle. The outlines 

 of the perivascular sheath are here obliterated, and the structure of the wall has become 

 indistinct, (a) artery ; (6) masses of nucleated cells and nuclei surrounding the vessel ; 

 (c) fusiform cells mingled witli the growth ; (d d) lines of fusiform cells surrounding the 

 capillaries; (e) a capillary obliterated; and (/) another capUlary obliterated, with enlarged 

 nuclei in its walls. X 700 diam. 



Fig. 4. — Shows the gradual Thickening of the "Walls of the Alveoli surrounding a Tubercular Granula- 

 tion. The gradual obliteration of the tumen of the air-vesicles is distinctly seen. X 100 

 diam. ; binocular arrangement. (Guinea-pig.) 



Fig. i). — Enlargement of Nuclei of Capillaries of Lung preceding their obliterations, x 700 diam. 



(Guinea-pig.) 

 Fig. G. — Enlargement of Nuclei of CapUIaries of Lung. Failure of injection. X 700 diam. (Guinea- 



Pig-) 

 Fio. 7. — Growth of Masses of Nucleated Cells around Capillaries in Walls of Alveoli of Lung at margin 



of a mass of Tubercle. At {a a) a denser mass of tubercle, with capillaries partially 



obliterated. X 700 diam. (Guinea-pig.) 



Fig. 8. — Growth of Fusiform Cells around Capillaries of Air-vesicles, x 700 diam. (Guinea-pig.) 



PLATE IIL 



Fig. 1. — Omentum of Guinea-pig. Tubercle around a small artery (a), which bifurcates into two 

 branches (5 6). The tubercle is seen to consist of a mass of nucleated cells, and of nuclei 

 around which no outer cell wall is visible. These which are more closely agglomerated 

 around the vessel become more spattered at greater distances. The meshes of the omentum 

 become gradually obliterated by the growth. Some large nucleated cells are seen among the 

 growth. X 700 diam. 



Fig. 2. — Omentum of Guinea-pig. Masses of tubercles situated on the vessels (a 6), a small artery and 

 attendant veins. The growth of cells can be seen in places extending along the vessels for 

 some distance from the larger masses. The extension into the neighbouring tissue of the 

 omentum can also be observed. X 100 diam. (reduced). 



Fig. 3. — Omentum of Guinea-pig. Small mass of tubercle, having no apparent connexion with vessels. 

 The thickening and filling of the meshes of the omentum with cells and nuclei can be seen 

 here, as in Fig. 1. x 700 diam. 



Fig. 4. — Tubercle of Liver (Guinea-pig), {a a a a) Acini of liver. (& h) Bile ducts, marked by columnar 

 epithelium, (c c) Growth of tubercle, which extends in all directions between the acini, 

 pressing them aside, {d d d) Spots where the tubercular growth is passing between the 

 cells of the acini separating tliese. (e e) Isolated liver cells, left unchanged amid the growth 

 of the tubercle, x 100 diam. 



Flo. .5. A, B. — Isolated portions of the Tubercular Growth in the Liver, x 700 diam. 



A. Shows nucleated cells imbedded in the meshes of a fibrous network. 



B. A mass of nuclei forming a string or obliterated tube. 



Fig. G. — Portion of Subcutaneous Tissue amid Granulations near scat of injury, showing a multiplication 

 of oval, round, and fusiform cells in the fibrous tissues. At {a a a) is a dense mass of 

 nuclei, forming an irregular string or cord, x 700 diam. 



Fig. 7. — I.'iolated Cells, from margin of Fig. 6. The larger cells measure l-800th x 1-lOOOth of an 

 inch. Fusiform cells are seen in process of division, x 700 diam. 



Fio. 8.— Section of a Subcutaneous Granulation, near seat of injury. Shows nucleated cells imbedded 

 in the meshes of a fibirous network, x 700 diam. 



/ 



