SYSTEMATIC SYNTHESIS OF ELEMENTS. 155 



tions, or in the same proportion but in a different order, 

 exhibit entirely different characteristics ; and therefore, 



31. Ittus. A, B, (7, THREE DIFFERENT ELEMENTS, may" unite to- 

 gether directly ; or, A and B may first unite, and the compound then 

 unite with (7; or, A and (7ma^ first unite, and that compound with B\ 

 or C and B may first unite, and then with A : thus from the same propor- 

 tions of the same three Elements, four compounds, with very different 

 characteristics, may be supposed to be produced. Vary the proportions 

 of either, and four more might result. So that the thirteen Elements 

 are surely enough to allow all the compounds required for exhibiting all 

 the diversities of characteristics needed in the Body. Indeed, 



32. IT WILL BE FOUND, UPON ANALYSIS OF THE DIF- 

 FERENT PARTS OF THE BODY, that several of the thirteen 

 Elements are in very small quantities, and exist in only 

 a few parts, and that, in fact, the active parts of the 

 Body are constituted of the very small number of six 

 Elements. 



33. THE THIRTEEN ELEMENTS ARE NAMED Oxygen, 

 Hydrogen, Carbon, Nitrogen, Phosphorus, Sulphur, Cal- 

 cium, Magnesium, Silicon, Potassium, Sodium, Chlorine, 

 and Iron. 



34. IRON exists in the Blood-cells, and may have 

 some subsidiary office in the preparation' of the higher- 

 tissues, or serve a purpose as a carrier of Oxygen. 



35. CHLORINE is a gas, but is not thus found in 

 Nature. It is one of the components of common Salt, 

 and is therefore a very common article, and in that form 

 is found in most of the liquids of the Body. It is also a 

 very important component of Gastric juice. 



36. SODIUM is a silvery-colored, very light metal; 

 not found thus in Nature. It is the other component of 

 Salt, the technical name of which is Chloride of Sodium, 

 and in that form exists in most of the liquids of the 

 Body. 



37. POTASSIUM is a bluish gray metal; not found 

 simple in Nature : combined with Chlorine, it exists as a 



81. What said ? 32. What ? 33. What ? 34. Describe . 85. Describe 

 . 36. Describe . 37. Describe . 



