Qua-qua-versal. The dip of beds in every direction from an elevated central point. The beds on the flanks of a volcanic cone dip in this way.
Quartz. The common form of silica; rock-crystal and flint are examples.
Raceme (in botany). When the florets are arranged along the sides of a general peduncle.
Radiata. A division of the animal kingdom so called because the body is frequently presented in a radiated form like the common star-fish.
Reticulated. A structure of crossed fibers, like a net, is said to be reticulated.
Rock (in Geology). Any mass of mineral matter of considerable or indefinite extent and nearly uniform character, is called in geological language a rock, without regard to its hardness or compactness: thus, loose sand and clay, as well as sandstone and limestone, are spoken of under this name.
Rock salt. Common salt occurring in a crystalline state in rocks.
Roe-stone. The name sometimes given to Oolite.
Ruminantia. An important group of quadrupeds including those which chew the cud, as the ox, deer, &c.