384 Studies on the Palceozoic Soils of North Wales 



interest. It is fairly high in the Paleozoic silt loams and is not low 

 in any type of soil except the wind-blown sands. 



8. From the results obtained, it will be evident that the Palaeozoic 

 soils of North Wales differ, not only genetically, but also in their 

 properties and constitution from the soils hitherto studied in this 

 country. Further, the agricultural treatment of them, involving as it 

 does comparatively long periods under grass alternating with arable 

 cultivation, introduces a number of factors which, together with the 

 climate, must be considered in devising schemes for manuring and soil 

 treatment. A considerable amount of experimental work in field and 

 laboratory would therefore appear to be necessary in order to discover 

 to what extent the results of English experiments can be applied to 

 the treatment of North Welsh soils. 



It now remains to thank numerous friends for advice and assistance 

 in the work. Hearty thanks are due to colleagues in the Agricultural 

 Department at Bangor, in particular to Dr J. Lloyd Williams, now 

 Professor of Botany at Aberystwyth, who first introduced the writer 

 to North Wales and its soils. The writer is also indebted to Dr E. J. 

 Russell and Mr A. D. Hall for helpful criticisms and suggestions. 

 Lastly, the courtesy and kindness of the farmers of North Wales who 

 have been visited during the past four years is noted and gratefully 

 acknowledged. 



{Received January 2Qth, 1917.) 



