74 ON INCREASING THE GROWTH OF PLANTS. 



Phosphorite, and a few other kinds of stone, 



Poor guano, 



Raw bones, bone-dust, 



True guano, 



Animal substances of all kinds. 



Oil-cakes, malt-grain from breweries, 



Solid human and animal excrements, 



Stable-manure, 



Urine of carnivorous animals, 



Wood-ashes, straw, leaves, etc. 



VI. Manures containing Sulphuric Acid (partly 

 direct manures, partly absorbents of manuring 

 substances). 



Gypsum, sulphuric acid. 



Green vitriol, sulphur-coal. 



Many sorts of brown-coal. 



Ashes of pit-coal, turf, and brown-coal. 



VII. Manures rich in Lime. 



Burnt lime, chalk, marl, 

 • Gypsum, ashes of brown-coal and turf. 

 Building-rubbish, pond-mud, soap-boilers' ash- 

 es. 



VIII. Manures rich in Silica. 



Pit-coal ashes, as also ashes of all sorts, 

 Sand, straw, stable-manure, etc. 



IX. Manures that pulverize the Soil. 



Sulphuric acid, muriatic acid, 

 Lime, marl, humus, etc. 



