Soils, their formation, properties, composition, and relations to climate and plant growth in the humid and arid regionsNote 22 — Chapter IV · THE VARIOUS ROCKS AS SOIL-FORMERS.Reading editionRep. Conn. Agr. Expt. Stn., 1886, 1887.◇Copy noteReturn to CHAPTER IV. THE VARIOUS ROCKS AS SOIL-FORMERS.