152 COLLEGE BOTANY 



A solid is also composed of particles, but is much less mobile 

 than a liquid, and it retains its form more or less perfectly. 

 Some solids are soluble in liquids and some are soluble in other 

 solids. Some may be liquefied and then vaporized. 



Solution. All gases, liquids and solids are made up of par- 

 ticles, and when the particles of two are brought in contact they 

 usually tend to intermingle to a greater or less degree ; i.e. , one 

 is dissolved by the other. Gases are very generally dissolved in 

 liquids, the liquid being the solvent and the gas the solute. Many 

 solids are dissolved in liquids; the liquid being the solvent and 

 the solid .the solute. Some liquids are dissolved in others ; e.g., 

 glycerine in water, the water being the solvent and the glycerine 

 the solute. Some liquids, such as oil and water, will not inter- 

 mingle. In some cases a solid is dissolved in a measure by 

 another solid, but the process is always very slow ; e.g., the par- 

 ticles of lead and gold, if kept in contact for a long period of 

 time, will intermingle very slowly. 



