OF HETEROLOGOUS ACCIDENTAL TISSUES. 527 



ARTICLE I. 

 OP ANALOGOUS ACCIDENTAL TISSUES. 



833. These tissues resemble more or less perfectly the 

 tissues of the healthy man. 



They are alterable like the natural tissues, and even more so. 



These tissues are of two sorts: 1st, some are the result of 

 the adhesion of the lips, of a solution of continuity, or of re- 

 generation after a loss of substance; 2d, the others are a result 

 of a production altogether accidental. Both have been de- 

 scribed under the head of each tissue (Chap. \ to x). 



834. The demi-analogous tissues are, 1st, some of the 

 above tissues, which do not attain a perfect degree of organi- 

 zation: such are especially cicatrices or. accidental cutaneous 

 productions, the production of the white compact and flaccid 

 tissue, demi-cartilaginous productions, earthy and stony ossi- 

 fications, imperfect corneous productions, &c. ; 2d, there are 

 also the pearly production, analogous to the natatory bladder 

 of fishes, observed in the walls of cysts ; the production of 

 fungus in laminae, etc. 



ARTICLE U. 

 OF HETEROLOGOUS ACCIDENTAL TISSUES. 



835. Heterologous accidental tissues, morbid, or without 

 analogy in the healthy organization, arc numerous. The most 

 common and best characterized are, tubercles, schirrus, the 

 encephaloid tumours and melanosis; some others of more rare 

 occurrence will be indicated hereafter. 



836. These tissues commence probably in the fluid state; 

 but from the moment they are perceptible they are solid. 

 They remain for a greater o* less time in this state, which is 

 called that of crudity or of organization; a state in which they 

 may be compared to zoophytes, in which they present, for the 

 most part, vessels, and are injurious only mechanically* They 



afterwards soften j decompose and liquify. In this state, which 

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