APPENDIX 



CHEMICOPHYSICS 



If we reflect upon all that surrounds us, even our- 

 selves, we find that we may classify the sources of all 

 our impressions under the heads of matter, energy, and 

 spirit. (Mallet) . 



Matter is any thing which occupies space. Hence 

 liquids, gases and solids are all forms of matter, and our 

 common experience proves that these substances may be 

 measured and determined to have length, breadth, and 

 thickness or any of these qualities. When matter ex- 

 tends in but one direction it has length; when in two, 

 we speak of it as area. 



Mass is the amount of matter contained in any body 

 under examination. 



Divisibility. All matter is capable of being divided. 

 We may break up a piece of iron or one of chalk into 

 many particles ; but finally a subdivision is reached be- 

 yond which we are, so far, unable to go. This last sub- 

 division is so minute as to be invisible and is called an 

 atom, the unit by which different forms of matter unite 

 with similar units of other forms to create combinations. 



Matter, as has been seen, exists in three states, liquid, 

 gaseous and solid. Matter in any state has its peculiari- 

 ties which we designate the properties of matter. Thus 

 a body may be elastic, returning to its original form 

 after bending or twisting; porous, having spaces between 

 its particles in which other matter may insinuate itself 

 an apparent exception to the law of impenetrability, 



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