Riohamba, earthquake at, 204, 205, 208, 213, 214.
Ritter, Carl, on his "Geography in relation to Nature and the History of
Man," 48, 67.
Robert, Eugene, on the ancient sea-line on the coast of Spitzbergen, 296.
Robertson on the permanency of the compass in Jamaica, 181.
Rocks, their nature and configuration, 228; geognostical classification into
four groups, 248-251; i. rocks of eruption, 248, 251-253; ii. sedimentary
rocks, 248, 254, 255; iii. transformed, or metamorphic rocks, 248, 259, 255,
256-269; iv. conglomerates, or rocks of detritus, 269, 270; their changes
from the action of heat, 258, 259; phenomena of contact, 258-269; effects of
pressure and the rapidity of cooling, 258, 267.
Rose, Gustav, on the chemical elements, etc., of various aerolites, 131; on
the structural relations of volcanic rocks, 254; on crystals of feldspar and
albite found in granite, 251; relations of position in which granite occurs,
252-269; chemical process in the formation of various minerals, 265-269.
Ross, Sir James, his soundings with 27,000 feet of line, 160; magnetic
observations at the South Pole, 187; important results of the Antarctic
magnetic expedition in 1839, 192; rarity of electric explosions in high
northern regions, 337.
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