AGENTS PROMOTING AVASTE. 63 



(^4) Potassii Carhonas, potassium carbonate. 

 (B) Potassii Bicarhonas^ potassium bicarbonate. 

 Dose of either of these for H., § ss.-i. ; D., gr. 

 x.-xxx. 



(^) is prepared from wood ashes or by burning 

 potassium tartrate with charcoal. 



{B) is prepared by passing carbonic - acid gas 

 through a strong aqueous solution of the neutral 

 carbonate. Occurs in transparent, colorless, rhombic 

 prisms, soluble in four times its own weight of 

 water. 



Potassii Nitras, potassium nitrate, nitre, salt- 

 petre. Dose: As febrifuge, H., 3i3.-iv. ; D., gr. 

 v.-xv. As diuretic, H., gss.-i.; D., gr. x.-xxx. 

 Occurs as whitish, opaque, crystalline masses, or 

 transparent, colorless six-sided prisms, having a 

 sharp, cooling, saline taste, permanent in air, and 

 soluble in three and one-half parts of cold water. 



Pofassu C/i/o7'as, potassium chlorate. Dose: H., 

 3i.-iv. ; D., gr. v.-xv. Occurs as colorless rhom- 

 boidal plates, having a saline cooling taste, and solu- 

 ble in sixteen parts of cold water ; prepared by rapidly 

 passing chlorine gas through a strong solution of po- 

 tassium carbonate and calcium hydrate. 



Potassii Permanganas, potassium permanganate. 

 Small, dark-brown, needle-shaped or prismatic crys- 

 tals, soluble in sixteen parts of cold water, making a 

 deep-red solution. 



Potassii lodidum.See under "Iodides." 



Potassii Bromidum. — See under "Bromides." 



