THE NATURAL ARRANGEMENT. XX11I 



GENERAL PROPERTIES OF THE ORDERS 

 OF CLASS III. 



Order I. RESIN. (M.) 



H. 0-0... 2-5. 

 G. 0-7... 1-6. 



Order II. COAL. (M.) 

 Streak brown, black. 

 H. 1-0... 2-5. 

 G. 1-2... 1-6. 



GENERAL PROPERTIES OF THE GENERA 

 OF CLASS I. with an enumeration of the Species 

 they contain. 



I. GAS. 



Gen. I. HYDROGEN GAS. (M.) Odor disagreeable. 

 Sp. 1. Pure (M.) Hydrogen. 



2. Empyreumatic (M.) Car bur etted Hydrogen. 



3. Sulphuretted(M.) Sulphur etted Hydrogen. 



4. Phosphuretted(M.) Phosphuretted Hydrogen. 



Gen. II. OXYGEN GAS. (S.) 

 Sp. 1. Pure (S.) Oxygen. 



Gen. III. NITROGEN-GAS. (S.) 

 Sp. 1. Pure (S.) Nitrogen. 



Gen. IV. ATMOSPHERIC-GAS. (M.) 

 Sp. 1. Pure (M.) Atmospheric Mr, 



II. WATER. 



Gen. I. ATMOSPHERIC-WATER. (M.) 



Sp. 1. Pure (M.) Water. 



