THE FOURTH EDITION. 17 



or liioigrij sand. Observation. Tliis last was compa- 

 ratively barren, without frequent applications of 

 large portions of manure, and which had only a 

 transient effect: was permanently improved by the 

 application of tenacious clay. 3. Fleath soil, or black 

 siliceous moor soil. 4. Rich siliceous sandy soil, Ob. 

 This, when on a clayey subsoil, produced large crops 

 for two successive seasons, but afterwards required 

 a regular supply of manure. When the subsoil was 

 porous, or consisted of gravel, the produce was very 

 inferior. It is properly a hungry soil, and requires 

 an addition of clay and calcareous earth, to render 

 it permanently fertile. 5. Sandy loam, or Brompto)i, 

 common loam. Ok This soil affords an illustration 

 of the term loam, in its general acceptation among 

 husbandmen and gardeners in the neighbourhood of 

 London. 6. Rich black clayey loam. 7. Clayey loam. 

 8. Tenacious clay. 9. Rich alluvial soil, partly formed 

 by depositions from flowing water. Ob. Of all the 

 soils employed in the experiments, this one was the 

 most productive : it was upon a porous subsoil ; all 

 the superior grasses flourished here in an extraor- 

 dinary degree; it therefore offers data whereby to 

 judge of soils most suitable for grasses, 10. Vege- 

 table mould. 11. Active peat, or fertile peat moss. 

 12. Inert peat, or barren peat moss. 



Beds of these soils (No. 2 and No. 8 excepted) 

 were arranged in the order in which they have been 

 named above. Seeds of all the grasses peculiar to 

 eajch soil, were sown on distinct spaces of each bed. 

 The seeds vegetated on all the soils, except on No. 12 

 which remained completely barren. In the ensuino- 



