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beds of the Silurian age, corresponding to the Acadian and Potsdam periods in American geology. It is called also Cambrian, and by many geologists is separated from the Silurian.

lectures, or instruct students, in a particular branch of learning; as a professor of theology, of botany, of mathematics, or of political economy.

An error in chronology, consisting in an event being dated before the actual time.

Relating to promorphology; as, a promorphological conception.

One versed in the science of promorphology.

rce; place where found or produced; provenance; -- used esp. in the fine arts and in archæology; as, the provenience of a patera.

Psychology.

A combining form from Gr. the soul, the mind, the understanding; as, psychology.

Of or pertaining to psychology. See Note under Psychic. -- Psy`cho*log"ic*al*ly, adv.

One who is versed in, devoted to, psychology.

One who is versed in pteridology.

e Purbeck stone, or Purbeck limestone, belonging to the Oölitic group. See the Chart of Geology.

One who is versed in, or makes a study of, pyrology.

The Quaternary age, era, or formation. See the Chart of Geology.

nadian period have been divided in the American Lower Silurian system. See the Chart of Geology.

One who is versed in quinology.

A rabbinic expression or phraseology; a peculiarity of the language of the rabbins.

t point, predicted the coming reaction. Macaulay. Reaction time (Physiol.), in nerve physiology, the interval between the application of a stimulus to an end organ of sense and the reaction or resulting movement; -- called also physiological time. -- Reaction wheel (Mech.), a water wheel driven by the reaction of wate…

To make a special study of, as by perusing textbooks; as, to read theology or law. To read one's self in, to read about the Thirty-nine Articles and the Declaration of Assent, -- required of a clergyman of the Church of England when he first officiates in a new benefice.

ain to barbarism. -- Re*bar`ba*ri*za"tion, n. Germany . . . rebarbarized by polemical theology and religious wars. Sir W. Hamilton.