G. AV. Robinson 



377 



They are never found in cultivation and at best carry an inferior 

 grass herbage. 



The average composition of three samples of Deep peat is given. 



The deep peats are notably deficient in potash. It will be seen that 

 the subsoil is slightly richer in organic matter than the soil. This is 

 not onlv true for the average but for the individual samples. 



Table IX. Deep Peat. 



Fine gravel 

 Coarse sand 

 Fine sand 

 Silt ... 

 Fine silt 

 Clay ... 



Moisture 

 Organic matter 

 Calcium carbonate 



Nitrogen 



48 hours'' digestion with HCl 

 Potash (KoO) 

 Phosphoric acid (P2O5) 

 Calcium oxide (CaO) 

 Magnesium oxide (MgO) 

 Insoluble ... 



Soluble in 1 % citric : 

 Potash (K.O) 

 Phosphoric acid (P2O6) 



Gors-y-bol 

 A 46 



Nant Ffrancon 

 Golan C 28 C 47 Bodeilio A 17 Maenan C 50 



Soil Subsoil Soil Subsoil Soil Subsoil Soil Subsoil Soil Subsoil 



2-23 



— 1-58 



1-94 — 



1-45 



1-50 — 



Conclusions. 



The main types of Palaeozoic soils in North Wales having now been 

 described it remains to consider in what respects they resemble each 

 other and to note in what respects they differ from other soils studied 

 hitherto. 



1. In mechanical composition it will be noticed that with the ex- 

 ception of sands, alluvia and peats, the soils of this area are of a loam 

 texture. Sandy soils are only found near the sea coast and clay soils 

 are very rare. With the high rainfall, however, many of the heavier 

 loams present to the cultivator the difficulties of clay soils. Looking 



