NECROSIS OF TISSUES. 



17 



Fig. 2. 



set of microscopic objects make their appearance ; of these the 

 following present most points of interest : 



a Leucin, produced in gangrene of the lungs, liver, spleen, 

 and pancreas ; it separates in the form of a whitish, opalescent 

 substance, in homogeneous drops or spherules, or in concen- 

 trically laminated corpuscles, or finally in knobs of slender, 

 needle-shaped crystals (fig. 2, a).* 



P TyPvOSIN, commonly found 

 with leucin, in the form of white 

 needles with a silky lustre ; these 

 are either solitary, or when of 

 considerable leno;th and thickness, 

 united to form sheaves and stars 

 of great beauty (fig. 2, Z>). 



y Margarin. a crystalline mix- 

 ture of two solid fats, stearin and 

 palmitin. It is peculiarly abundant 

 in mortified tissues. It occurs in 

 needles, either isolated or in clusters 

 radiating from a common centre 

 (fig. 2, c). 



8 Triple Phosphate — ammo- 

 niaco-magnesian phosphate — occm's 

 only in alkaline or neutral sanies. 

 The forms which it most frequently 

 assumes are modifications of the 



rhombic vertical prism, which 

 closely resemble coffin lids (fig. 2, cl). 



Products of gangrenous de- 

 composition, a. Leucin; h. 

 Tyrosin ; c. Fat-crystals ; 

 d. Ammoniaco - magnesian 

 phosphate ; e. Ganorrene- 

 corpuscles (black pigment) ; 

 /. Yibriones, ^i^. 



* Virclwiv says, with reference to the intimate connexion between 

 these divers forms {Archiv viii. 337) : " On allowing leucin to crystallise 

 from solution, we always see, to begin with, very minute roundish gran- 

 ules appearing in even the smallest drops of a viscid material, differing 

 from oil globules by their feebler lustre and paler outline. Two or more 

 of these frequently unite to form large drusy {i.e. studded with minute 

 crystals) figures, or shoot into radiating clusters. If crystallisation 

 proceeds very slowly, they remain more independent ; their individual 

 growth making them assume, more and more distinctly, the form of 

 faintly yellow spherules, which often exhibit in addition a concentric 

 lamination. They often show no sign of their being made up of a 

 number of minute needles ; on the other hand, masses of closely-packed 



2 



