Kitroze— The Distribution of Drift in Ireland. 429 
limestone boulder-clays, and gravels; and this substance is known 
to have been embedded in limestone. The latter material there- 
fore seems to have been dissolved away, possibly to a great extent 
since the porous Upper clays were deposited, leaving the but 
slightly soluble chert. Blocks and pebbles of “rottenstone,” after 
calcareous grits and shale, also occur abundantly in the Upper 
clays, with scarcely any calcareous matter remaining. ‘This dis- 
solving out of calcareous matter from the soil of Ireland has 
been hastened probably by cultivation, but is doubtless due chiefly 
to the humidity of the climate. 
[TABLE OF SOILS, SUB-SOILS, ETC. 
