THE MODERN THEORY OP CEEMICAL TYPES. 



163 



The four compounds represented above are supposed to be constituted after 

 the pattern of water, which is the type. Thus, if the oxygen atoms of the type 

 are rephiced by sulphur atoms, we have sulphuretted hydrogen. 



If, iu the type, we substitute for the hydrogen block, upon the left hand, a 

 potassium block, the result is hydrate of potassa. If, on the other hand, we re- 

 move a right-hand block of hydrogen, and substitute a block representing the 

 radical acetyle, we have acetic acid. And if we replace each hydrogen block 

 of the type, one with a potassium block and the other with an acetyle block, 

 there results acetate of potassa. 



In the above illustration the compounded blocks are of one size, thus repre- 

 senting a volume of four oxygen blocks, and conforming to the law of conden- 

 sation of organic compounds to four volumes. We must bear in mind that the 

 individual blocks may be larger than an oxygen block when outside of the 

 type, though condensed to the size of such block in the compound. For ex- 

 ample, 2 volumes of oxygen + 4 volumes of hydrogen = 6 volumes, which are 

 condensed, by combination of the gases, to 4 volumes of vapor of water. 



Hydrogen constitutes another type, thus : 



HYDROGEN TYPE. 



Benzole and Acetone examples of this type are represented thus : 

 Benzole. Acetone. 



