. Chambers's encyclopedia; a dictionary of universal knowledge for the people. is not morethan the eighth or tenth part of the creature, willbecome complete and perfect in all its organs.—Eymer Jones. PLAXE, in Geometry, is a surface without cur-vature, and the test of it is, that any two pointswhatever being taken in the surface, the straightline which joins them lies wholly in the two planes cross or intersect one another,their common section is a straight line ; and theinclination of the planes to each other is measuredby taking any point in their common section, anddrawing fro
. Chambers's encyclopedia; a dictionary of universal knowledge for the people. is not morethan the eighth or tenth part of the creature, willbecome complete and perfect in all its organs.—Eymer Jones. PLAXE, in Geometry, is a surface without cur-vature, and the test of it is, that any two pointswhatever being taken in the surface, the straightline which joins them lies wholly in the two planes cross or intersect one another,their common section is a straight line ; and theinclination of the planes to each other is measuredby taking any point in their common section, anddrawing from it two straight lines, one in eachplane, perpendicular to the common section; theangle contained by these lines is the angle of inclin-ation of the planes. When the angle is a rightangle, the planes are perpendicular to each other. PLAXE {Platanus), a genus of trees, the solegenus of the natural order Platanacece, regarded bymany as a sub-order of AmentaceoB (q. v.). Theflowers are in globose stalked catlcins ; the ovary isone-celled, and contains one or two i)endulous. Plane Tree {Platanus orienUdis). ovules. The species of P. are few; natives oftemperate climates in the nurthern hemisphere ;tall trees, with smooth whitish bark, which annu-ally scales off in large pieces, and large palmatedeciduiius leaves. The catkins are small, andcuriously ])laced one above another on the samestalk; they are j)endulous, with long stalks, andgive plane trees a very peculiar appearance, especi-ally in winter, when tliey remain after the leaveshave fallen.—The Oriental P. (P. orif-ntaUs), anative of Greece and the East, was much admiredand planted, both by the Greeks and the Romans,as an ornamental tree; no other tree, indeed, com-manding equal admiration; and, for centuries, theyouth of Greece assendjled under the shade ofplanes, in the groves of Academus and elsewhere,to receive lessons in j)hiloso])hy. To this day, theP. Ls generally planted for shade and ornament in the south of Euro
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