234 



Scientific Proceedings, Royal Dublin Society. 



Table 1. 



Solution. pB.. 



Peat, S. of Ireland bog . . 4-1 



,, Dartmoor . • 4-6 



,, Dublin Mts. . . 4-6 



Disintegrating granite, Dartmoor 5-2 



Light soil, over slate . . 5'4 



Surface soil, copse, in alkaline district. 6-4 



Clay soils, heavy . • 5-4-6'8 



Garden soil . • • 6-5-7-5 



Limestone soil . . . 7'6-8-2 



Bog pool, Dartmoor . . 5'0 



Bog stream, Dartmoor . . 5-S 



Eain water . . . 5'9 



E. Yealm, Dartmoor . . 6-4-6-8 



Stream, Devon . . . 8'2 



Sea water . . . 8-2 



Small reservoir . . . 7-6-9-2 



Notes. 

 Saturated solution. 



No vegetation. 



Bracken thrives. 



Surface is more acid than subsoil. 



These become less heavy if limed. 



Common values. 



Where limestone is not leached out. 



Typical amber water, tadpoles 

 abundant. 



Light amber water, no recent rain. 



Acid from carbonic acid. 



Examined where streams from sedi- 

 mentary rocks flow in. 



Calcium bicarbonate saturation 

 value. 



Slight seasonal changes occur. 



Depending on season, most alkaline 

 when photosynthesis is active. 



