228 THE MICROSCOPIST. 



7. Adipose Tissue. The fluid fat leaves the cells and 

 gives an appearance of emulsion to the mass. 



8. Fibres of loose connective tissue swell, become stained 

 with the coloring matter of blood, granulate, and liquefy, 

 or they may desiccate by evaporation. 



9. Elastic fibres and networks resist longer than the last. 

 Hence elastic fibres may be found in expectorated matter 

 from gangrene of the lungs, etc. Later, they break into 

 granular striae, then into molecules, and vanish. 



10. Cartilage resists long, but melts away at the edge, 

 first becoming transparent and reddish. The cells fill' 

 with fat-globules from fatty degeneration of bioplasm. 



11. Bone retains its structure in necrosis, and hence is 

 recognized by the surgeon in sequestrse, yet it decays in 

 patches. The bioplasm becomes flat in the cells, acid fluids 

 dissolve the lime salts, and the remaining structure disin- 

 tegrates like cartilage. 



The ichorous fluid into which all tissues are resolved, 

 finally ends in carbonic acid, ammonia, and water, but 

 the metamorphic substances resulting from the various 

 preceding changes are not yet well known to histo-chem- 

 istry. Some of them are volatile, sometimes giving rise 

 to emphysematous or crepitant gangrene, and are of bad 

 odor ; others are more solid, and produce interesting mi- 

 croscopic objects, as leucin, ty rosin, margarin, ammonio- 

 magnesian phosphate, and pigment-granules. At page 

 135 we have referred to the presence of bacteria and vib- 

 riones, and their origin from fungi, in decaying animal 

 matters. 



II. MORBID ACTION IN TISSUES. 



1. Infiltration. This consists in the deposition or filtra- 

 tion of material from the blood, and is caused by adultera- 

 tion of the blood or certain peculiarities of tissues. Thus 

 for infiltration of fat, the liver and areolar connective 

 tissue is most fitted; for superfluous salts of lime, the 



