APPENDIX 



COMPOSITION OF SOILS. 



Snyder gives the following average composition of 200 fertile 

 soils; analysis was made by strong hydrochloric acid. 



Insoluble matter , 79.95 Per cent. 



Potash 0.29 " " 



Soda 0.25 " 



Lime 2.16 " " 



Magnesia 0.55 



Iron oxide 2.68 " " 



Alumina 5.20 " 



Phosphor acid . 24 



Sulphur trioxide 0.03 " " 



Carbone dioxide 1.12 " " 



Volatile matter 7.00 " 



99.47 

 Volatile matter containing: 



Humus 3.35 " " 



Nitrogen , 29 " " 



