BOTANY FOR YOUNG PEOPLE. 31 



the body. When the blood comes to these 

 glands they take from it whatever they want, 

 and then manufacture from those materials the 

 substances required. It is in this way the liver 

 makes bile, and the lachrymal gland tears. 

 Plants have a similar set of little organs, or 

 glands, that from the pure juice make up the 

 essential oils, as Rose, Cinnamon, Lavender, and 

 Lemon ; the different salts, as Oxalic Acid, Qui- 

 nine, and Salacine ; and noxious compounds, as 

 the Upas juice, and Prussic Acid. Odors, pois- 

 ons, and medicines, are all made in this way, by 

 the life power, from the simplest elements. 



L. But we could not take those elements and 

 make them? 



E. Certainly not. It could only be accom- 

 plished by the agency of the life-power working 

 in its accustomed manner. Some years since 

 when it became generally known of what ele- 

 ments milk was composed, the chemists of Paris 

 undertook to supply that city with pure milk of 

 their own manufacture, but as they could not 

 govern the vital powers, their influence being 

 limited to the forces of mechanics and chemis- 

 try, the attempt signally failed. To-morrow, 

 we will commence studying the classincatiori~of 



