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PHA 89
Peri-cranium, $. from 'fr'epl, peri, about, and Kpa.VWV,
kmniun, the skull. The memhrane that covers the
skull.
Peri-ad, s. from 7rEpl, peri, about, and t5aos, It-()(lOs; a war.
The term period is variously emplo)"ed, hut still preserving
the primitive acceptation of a way about, a
circuit. Thus a period is said to be "a round of
,vards, which renders the sense completc,1I or a
"course of eyents." Time, included within any
given points, is termed a period. Thus the period
ofday, or of night, is the space oftime comprehended
hetween the rising ahd setting, or the setting and
rising of the sun. The period of a year comprehends
the space which the earth requires for its annual
revolution. So in an extended and moral application,
we have stated periods in our life.
Peri-oeci, s. See OIKEO, p. 22.
l:>eri-osteum, s. from 'lTEpl,peri,.about, and OG''TEOV, osteon,
a hone. The memhrane that covers the hones.
Peri-pateti.c, adj. from 7rEpt, peri, about, and '1rctTEW,
pat;Hi, I walk. A sect of philosophers were so named,
hecause they discoursed while '.walking.
Peri-phery, s. from "'