478 MORBID PRODUCTS. 



arranged in stellar groups; these consisted of urate of soda. 

 The concretion, when dried, was found to contain : 



Urate of soda . . . 52-12 



Urate of lime , . . .1-25 



Chloride of sodium . . . 9'84 



Phosphate of lime . . . 4-32 



Cellular tissue . . . 28-49 



Water and loss . . . 3-88 



A concretion of this nature, analysed by I/Heretier, yielded : 



Urates of ammonia, soda, and lime . .49 



Phosphate of lime . . .42 



Organic matter and water . 9 J 



Tubercle. 



Chemical analysis has hitherto thrown very little light on 

 the nature of tubercle, or on the mode of its formation. A 

 tubercular mass, analysed by.Preus, contained 19' 5 of solid 

 constituents and 80-5 of water. The solid constituents were 

 composed of a substance resembling casein in its relations to- 

 wards acetic acid and heat, a fat containing cholesterin, and a 

 very small quantity of salts. 



In an analysis which I instituted of a mass of tubercle from a 

 horse, I detected a little of the caseous matter noticed by 

 Preus. The tubercular matter was deposited in masses from 

 the size of a nut to that of a pigeon' s egg ; it varied from a 

 yellow to a flesh colour, and its consistence was such as to 

 admit of its ready division by the knife. Internally it was 

 green and resembled coagulated casein. It was composed of : 



Analysis 166. 



Water .... 84'27 



Fat containing cholesterin . . 1-40 



Spirit-extract with salts . . 1-52 



Caseous matter with water-extract . 1-14 



Water-extract and salts . . 3-80 



Insoluble constituents . . .4-44 



[The following ultimate analyses of tubercle, by Scherer, 

 are highly important in tending to throw light on the che- 

 mistry of its formation. 



Crude pulmonary tubercle yielded little fat or extractive 

 matter, showing that the morbid process was not far advanced. 



