pounds by building them up from their constituent 

 elements. 



What is a sulphide? 



It is a salt formed by the direct union of two ele- 

 ments, one being sulphur. 



What is a Sulphite? 



It is a salt formed by the action r of Sulphurous 

 Acid on a base. 



What is a Sulphate? 



It is a salt formed by the action of Sulphuric 

 Acid on a base. 



Give three rules governing the formation of salts. 



ist. The direct union of two elements form "ide" 

 salts. 



2nd. Acids ending in "ous" unite with bases to 

 form "ite" salts. 



3d. Acids ending in "ic" unite with bases to 

 form "ate" salts. 



What are the two grades of Acids? C. P., Chem- 

 ically Pure, and M. P., Medicinally Pure. 



Name menstruums in order of importance? 

 Water, Alcohol, Alcohol Dilute, Acetum and Ether. 



What is the heaviest essential oil? Oil of Gaul- 

 theria. 



What volatile oil contains sulphur? Oil of Mus- 

 tard. 



How many elementary substances are there? 



Sixty-seven. 



What is an inorganic acid? A mineral acid. 



What is an organic acid? An animal or vegetable 

 acid. 



What is meant by a Ferrous and a Ferric Salt? 



A Ferrous salt is one in which the iron exerts 

 bivalent activity. 



A Ferric salt is one in which it exerts trivalent 

 activity. 



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