PART I. 

 STCECHIOLOGY. 



STCEcniOLOGY 1 comprises the classification and description of the 

 vsimple chemical elements, and of the immediate principles which 

 enter into the composition of the tissues and fluids of which the 

 human body is composed. 



FIRST DIVISION, 



THE SIMPLE CHEMICAL ELEMENTS ENTERING- INTO 

 THE STRUCTURE OF THE HUMAN BODY. 



OF the sixty-five simple bodies now (1857 2 ) known to chemists, 

 it is not certain that more than fifteen are normal constituents of 

 the human body. These are 



1. Oxygen. 6. Phosphorus. 11. Chlorine. 



2. Hydrogen. 7. Calcium. 12. Fluorine. 



3. Carbon. 8. Magnesium. 18. Silicum. 



4. Nitrogen. 9. Sodium. 14. Iron. 



5. Sulphur. 10. Potassium. 15. Manganesium. 



M. Millon announced that copper and lead also normally exist in 

 the blood-corpuscles of man, and Orfila added arsenic as entering 

 into the composition of the tissues. These observations have, how- 



1 From iroiysTov, an element, and Xoyoj, description. 



2 Two or three others have just been announced, but their discovery has not 

 been confirmed. 



