84 INCOMPATIBILITY 



4. A mixture of salts in solution will decompose if 

 either an insoluble compound or double salt can be formed; 

 otherwise no change will take place. 



5. Chloral is incompatible with alkaline solutions, 

 because chloroform is generated. 



6. Chloroform and potassium cyanide form prussio acid. 



7. Potassium chlorate, nitrate, or permanganate liberate 

 oxygen and should not be mixed with readily oxidizable 

 substances, such as charcoal, sugar, sulphur, glycerin, car- 

 bolic acid, iodine, turpentine and organic materials, lest 

 explosive compounds be formed. 



8. Lime water precipitates mercury salts. 



9. Both calomel and antipyrin are incompatible with 

 sweet spirit of nitre. 



10. Calomel may not be combined with nitrohydro- 

 chloric acid lest corrosive sublimate result. 



11. Calomel and prussio acid form the poisonous mer- 

 curic cyanide. 



12. Liquid iron compounds are incompatible with fluid 

 preparations of the vegetable bitters (except those of calumba 

 and quassia), because the tannic acid in them throws down 

 a precipitate. 



13. Considerable quantities of acid are incompatible 

 with tinctures, since ethers are produced. 



14. Water precipitates resinous tinctures. 



15. Gum arable is incompatible with lead and iron salts, 

 and mineral acids. 



16. Strychnine is precipitated in solution by potassium 

 bromide. 



17. Pepsin and pancreatin are mutually destructive in 

 fluid combination. 



18. Solutions of potassium chlorate and iodide unite to 

 form a poisonous compound. 



It is beyond our scope to attempt the enumeration of 

 all possible drug-incompatibilities. The special incompati- 

 bilities of each drug may be found under the proper heading 

 in the detailed description of them. Furthermore, we may 



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