soluble in water, less so in alcohol. Internally, three 

 to eight grains in pills. Gonorrhoea, an injection 

 four to eight grains to an ounce of water, or as 

 bougies with cacao butter. 



URETHANE (ETHYL CARBAMIDE). White crystals, 

 soluble in water and alcohol. Used as a hypnotic, in 

 doses of fifteen to forty grains in capsule,, or a 

 draught. 



ELEMENTARY CHEMISTRY. 



The infinite variety of solid, liquid and gaseous 

 substances of which our earth and atmosphere are 

 composed may be resolved with more or less diffi- 

 culty into distinct forms of matter appropriately 

 termed Elements, because by no known means can 

 they be further decomposed. Sixty-seven elements 

 have been proved to exist. A few occur naturally in 

 the uncombined state, but the greater number are 

 combined in so subtle a manner as to conceal them 

 from ordinary methods of observation. Thus none 

 of the common properties of water indicate that it is 

 composed of two elements, both gases, but different 

 much from each other. 



The art by which this and all other compound 

 substances are resolved into their elements is termed 

 Chemistry. 



Persons who practice the art and science of Chem- 

 istry are known as Chemists. 



The art of Chemistry also includes the construc- 

 tion of compounds from elements, and the conver- 

 sion of substances of one character into those of 

 another. The general principles or leading truths 

 relating to the elements, to the manner in which 

 they severally combine, and to the properties of the 



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