. Practical methods of organic chemistry . n conducted as before. Pipettes of this kind arevery easily made from glass tubing; and if one is accustomed towork with them, are indispensable. Separation by Extraction. — When a substance is held in sus-pension or dissolved in a liquid, generally water, the removal ofthe dissolved substance may be effected by agitating the solutionwith another solvent which will more readily dissolve the substance,but which is not miscible with the first liquid, drawing off this and 42 GENERAL PART distilling it. For extraction, ether is generally used; in specialc
. Practical methods of organic chemistry . n conducted as before. Pipettes of this kind arevery easily made from glass tubing; and if one is accustomed towork with them, are indispensable. Separation by Extraction. — When a substance is held in sus-pension or dissolved in a liquid, generally water, the removal ofthe dissolved substance may be effected by agitating the solutionwith another solvent which will more readily dissolve the substance,but which is not miscible with the first liquid, drawing off this and 42 GENERAL PART distilling it. For extraction, ether is generally used; in specialcases carbon disulphide, ligroin, chloroform, benzene, amyl alco-hol, etc., may be used. In the discussion following it will beassumed that the extraction is made with ether. If the liquid to be separated is insoluble in water and is presentin such a small quantity that a direct separation would cause aloss owing to the adhesion of the liquid to the walls of the vessel,or if it is held in suspension by the water in the form of individual.
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