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froghopper

(Encyclopedia)froghopper or spittlebug, small, hopping insect of the order Homoptera. The adult, under 1⁄2 in. (1.2 cm) long in most species, is triangular in shape and usually gray or dull green to brown. Most f...

snow

(Encyclopedia)CE5 Snow occurs in many different forms. Among the various recognized classes of forms are (A) needles; (B) columns and groups of columns; (C) plates; (D) branched, or dendritic, plates; (E) combin...

rennet

(Encyclopedia)rennet, substance containing rennin, an enzyme having the property of clotting, or curdling, milk. It is used in the making of cheese and junket. Rennet is obtained from the stomachs of young mammals ...

slime mold

(Encyclopedia)slime mold or slime fungus, a heterotrophic organism once regarded as a fungus but later classified with the Protista. In a recent system of classification based on analysis of nucleic acid (genetic m...

oxygen

(Encyclopedia)oxygen, gaseous chemical element; symbol O; at. no. 8; interval in which at. wt. ranges 15.99903–15.99977; m.p. −218.4℃; b.p. −182.962℃; density 1.429 grams per liter at STP; valence −2. T...

Richter, Sviatoslav

(Encyclopedia)Richter, Sviatoslav rĭkhˈtər [key], 1915–97, Russian pianist, b. Ukraine. He studied at the Moscow Conservatory under Heinrich Neuhaus. After earning an impressive critical reputation, he was aw...

glacial periods

(Encyclopedia)glacial periods, times during which large portions of the earth's surface were covered with thick glacial ice sheets. In the Pleistocene epoch, in the Carboniferous and Permian periods of the Paleozoi...

Field, Marshall

(Encyclopedia)Field, Marshall, 1834–1906, American merchant, b. Conway, Mass. In 1856, after five years' apprenticeship in a general store in Pittsfield, Mass., he went to Chicago and became a clerk for Cooley, W...

lungfish

(Encyclopedia)lungfish, common name for any of a group of fish belonging to the families Ceratodontidae, Lepidosirenidae, and Protopteridae, found in the rivers of Australia, South America, and Africa, respectively...

MacMillan, Donald Baxter

(Encyclopedia)MacMillan, Donald Baxter, 1874–1970, American arctic explorer, b. Provincetown, Mass., grad. Bowdoin College, 1898, and studied at Harvard. After a decade of teaching, he went on the expedition (190...