70 -S-: DR. YELLOLY'S REMARKS ON THE 



well known, that no one deposit is strictly and unequivocally unmixed ; but is 

 blended, in various proportions, with others, so as to undergo, by this means, 

 more or less modification of character and appearance. 



Calculi consisting principally of one deposit. 



Lithic acid 81 



Lithate of ammonia 20 



Oxalate of lime 20 



Phosphate of lime 4 



Fusible calculus, or mixed phosphates ; that is to say, calculi com- 

 posed of the triple, or ammoniaco-magnesian phosphate, united 



with phosphate of lime 37 



Calculi consisting of two deposits. 



Lithic acid r.nd lithate of ammonia 37'-" 



oxalate of lime 1 1 



mixed phosphates 10 



phosphate of lime 2 



Lithate of ammonia and lithic acid 2 



oxalate of lime 25 



mixed phosphates I4 



phosphate of lime 1 



Oxalate of lime and lithic acid 10 



lithate of ammonia 1 



— mixed phosphates 15 



phosphate of lime 3 



Mixed phosphates and phosphate of lime 2 



^H ?:?a'.'iJijnE .':)/! Calculi consisting of three deposits. 



Lithic acid, phosphate of lime, and mixed phosphates 2 



oxalate of lime, and phosphate of lime 1 



oxalate of lime, and lithate of ammonia 2 



oxalate of lime, and lithic acid 4 



lithate of ammonia, and oxalate of lime 2 



