468 MORBID PRODUCTS. 



from the urethra of an ox, and in the above mentioned intes- 

 tinal concretion from an ass, has been very rarely observed ; 

 Pearson detected it in a gastric calculus from an ape; Kinast in 

 a similar concretion from a cow ; Pearson and John in the in- 

 testinal concretion of a horse ; and Vauquelin and Fourcroy in 

 bezoars. Uric acid was observed by Fourcroy in the intestinal 

 concretion of a horse. 



Concretions formed of agglomerated hairs are often observed, 

 especially in cows. They are usually brown and polished, but 

 not hard. 



[Several analyses of intestinal concretions have been recently 

 published by Von Bibra. 1 We give the two following as illus- 

 trations of their composition : 



Concretion from 

 intestines of horse. 



Ammoriiaco-magnesian phosphate . . 93*10 



Phosphate of lime .... 1-18 

 Matters taken up by alcohol and ether . . 0-43 



potash . . . 0-36 



Chloride of sodium . . . . 0'63 



Phosphate of soda . . . .0-31 



Water, vegetable fibre, traces of iron, and loss . 3*99 



Concretion from stomach 

 of a miller's horse, 



Ammoniaco-magnesian phosphate . . 93*02 



Phosphate of lime .... 1-01 



Matter taken up by alcohol . . .0-41 



by potash . . . 0-33 



Sand . 0-40 



Chloride of sodium and traces of phosphate of soda . 0'51 



Water, traces of iron, vegetable fibre, and loss . 4-32 



The occurrence of phosphate of soda is remarkable, as that 

 salt does not occur in the gastric juice.] 



Peculiar concretions are found in the intestinal canal of an 

 herbivorous animal inhabiting Persia and Thibet. They are 

 termed bezoar stones; they are round or oval; in colour they are 

 dark green, brown, or black ; they are polished on the surface, 

 and consist internally of concentric laminae. Some are soluble, 

 others insoluble in alcohol, but all dissolve in caustic potash. 

 The researches hitherto made with these concretions throw very 

 little light on their real composition. They are usually green 



1 Simon's Beitrage, pp. 404 12. 



