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y, advanced by Thomson (Lord Kelvin) on the basis of investigation by Helmholtz, that the atoms are vortically moving ring-shaped masses (or masses of other forms having a similar internal motion) of a homogeneous, incompressible, frictionless fluid. Various properties of such atoms (vortex atoms) can be mathematically…

e resistance against which a machine acts, as opposed to the power which moves it. [Obs.] Atomic weight. (Chem.) See under Atomic, and cf. Element. -- Dead weight, Feather weight, Heavy weight, Light weight, etc. See under Dead, Feather, etc. -- Weight of observation (Astron. & Physics), a number expressing the most…

Discovered or described by Olanus Wormius, a Danish anatomist. Wormian bones, small irregular plates of bone often interposed in the sutures between the large cranial bones.

id boiling at -109º C., and to a solid which volatilizes without melting. Symbol Xe or X; atomic weight 130.2.

yttrium or other related elements, as in euxenite and gadolinite. Symbol Yb; provisional atomic weight 173.2. Cf. Yttrium.

und in gadolinite and other rare minerals, and extracted as a dark gray powder. Symbol Y. Atomic weight, 89. [Written also ittrium.]

itannia, and other alloys, and is also largely consumed in electric batteries. Symbol Zn. Atomic weight 64.9 [Formerly written also zink.] Butter of zinc (Old Chem.), zinc chloride, ZnCl2, a deliquescent white waxy or oily substance. -- Oxide of zinc. (Chem.) See Zinc oxide, below. -- Zinc amine (Chem.), a white amor…

al zircon as a dark sooty powder, or as a gray metallic crystalline substance. Symbol Zr. Atomic weight, 90.4.

The dissection or the anatomy of animals; -- distinguished from androtomy.