BILIARY CONCRETIONS. 577 



The second calculus had the size of a pigeon's egg. It weighed 

 92 '6 grains, and was lighter than water. It was covered by a 

 brown envelope, which broke by the smallest concussion. It was 

 formed of various concentric layers which had a greenish-yellow 

 colour, and which covered a nucleus of inspissated bile. Its con- 

 stituents were, 



Cholesterin, 4 



Yellow matter of bile, . 70 

 Choleic acid, . 6 



Bile, ... 8 



Green resin, . 5 



Phosphate of lime and magnesia, 3 

 Oxide of iron and loss, . 4 



100* 



This calculus belonged obviously to the third class of gall- 

 stones. 



In 1830, MM. Bally and Henry, Junior, analyzed a gall-stone 

 of quite a different nature from the preceding, and seemingly 

 belonging to the fourth set of biliary calculi first noticed by Dr 

 Saunders. It was found in the gall-bladder of a patient who 

 died in the Hotel -Dieu of Paris. It was of the size of a hazel- 

 nut, had an ovoid shape, a white colour, and a soft consistence. 

 Its granular texture exhibited two or three points as if petrified, 

 which, when viewed under the microscope, exhibited a distinct 

 crystallization. It was destitute of smell, and heavier than 

 water. When heated, it was charred without flame, and gra- 

 dually consumed, leaving a residue of carbonate and phosphate 

 of lime. Its constituents were. 



Mucus or albumen, ... 10*81 



Carbonate of lime, . . . 72-70 



Carbonate of magnesia, trace. 



Phosphate of lime, . . 13 '51 



Oxide of iron, fat, and colouring matter, . 2-98 



1 00-00 f 



Another biliary calculus belonging to the fourth kind, but 

 very different in its constitution, had been described by Orfila in 



* Jour, de Pharmacie, xiii. 550. t Ibid - xvi - 196< 



00 



