JOURNAL OF AGRICULTURAL SCIENCE. VoL IX. No. 4. 



PLATE IV 



Oantrhyaya'-Ot^ 



' A. " Map showing Rivers and most important Mines of North Cardiganshire. Scale i " — 8'6 Miles. 



" B." Effect of galena upon Oats. See p. 388. 

 No. 27. Untreated. No. 29. "l % Pb. No. 51. -2% Pb. No. 33. •4'\, Pb. 



