. The chemistry of plant and animal life. Agricultural chemistry. CHAPTER XIX Calcium, Magnesium, and their Compounds i66. Occurrence of Calcium. — This element is found widely distributed in nature in the form of calcium car- bonate, CaC03, calcium phosphate, Ca3(P04)2, and cal- cium sulfate, CaSCU, and is a yellowish metal which readily oxidizes and decomposes water. It enters into the composition of both plant and animal bodies and takes an important part in life processes. Its compounds are useful in the industries, lime, cement, and mortar being some of the forms in ^ which it is employed
. The chemistry of plant and animal life. Agricultural chemistry. CHAPTER XIX Calcium, Magnesium, and their Compounds i66. Occurrence of Calcium. — This element is found widely distributed in nature in the form of calcium car- bonate, CaC03, calcium phosphate, Ca3(P04)2, and cal- cium sulfate, CaSCU, and is a yellowish metal which readily oxidizes and decomposes water. It enters into the composition of both plant and animal bodies and takes an important part in life processes. Its compounds are useful in the industries, lime, cement, and mortar being some of the forms in ^ which it is employed. Calcium is not easily separated from its compounds. 167. Calcium Car- bonate. — This com- pound, in the form of limestone and marble, is found exten- sively. It is somewhat sol- uble in water charged with carbon dioxid, and hence many waters, as stated in Section 65, owe their hardness to its presence. Calcium carbon- ate is used principally for the preparation of quicklime, 128. Fig. 56. Sec'ion of lime Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Snyder, Harry, 1867-1927. New York, The Macmillan company
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