156 DETAILED SYNTHESIS. 



component of Chloride of Potassium in small quantities 

 in most of the liquids of the Body. 



38. SILICON in very small quantities is a component 

 of hair. 



39. MAGNESIUM is a white metal, that does not exist 

 in Nature pure, but is found in large quantities as a 

 component of Carbonate of Magnesia and of Magnesian 

 Limestone. It exists in small quantities in the Bones 

 and some other parts of the Body. 



40. CALCIUM is a metal, the basis of lime, in which 

 form, combined with carbonic acid, it is a component of 

 the Bones, and in small quantities of other parts. 



41. SULPHUR is found in small quantities in all the 

 liquids and tissues of the Body, except fat. Its special 

 office is not known, but it is evidently a necessity to 

 Human life in all its forms. 



42. PHOSPHORUS, a now well-known waxy substance, 

 used in making friction matches, not found pure in Na- 

 ture, is an element of nearly all the Tissues. It exists, 

 combined with lime (phosphate of lime), in large quan- 

 tities in the bones, giving hardness to them. It also 

 exists in the Brain and Nerves, and especially abounds 

 in the gray part of the Brain. It is one of the most 

 important Elements, since the student must suj^ty food 

 containing it abundantly, if he would use his Brain 

 actively without exhaustion. 



43. NITROGEN is a gas constituting nearly four fifths 

 of the Atmosphere, and is an important Element of all 

 the Tissues and liquids in the Body, except fat. It is not 

 however taken into the Blood from the atmosphere, bu\, 

 must come in as a component of food. 



44. CARBON is a solid, well-known substance, un- 

 der the form of coal or diamond. In the Body it is 

 always combined, being a component of Bones in con- 

 nection with lime (carbonate of lime), assisting with 



88. Describe . 89. Describe . 40. Describe . 41. Describe . 42. De- 

 scribe . 43. Describe . 44. Describe . 



