Euthyneura (uthinura)

pl. [NL., range ment, good order, εύτακτος, well-ordered, σειν, arrange, order: see tactic.] Good or rightwiste order. This ambition made Absalom rebel; nay, it endangered euthyneural (u-thi-nu'ral), a . Pertaining to Water house, Apol. for Learning (1653), p. 134. eutectic (u-tek'tik), a . and n. [ εὐ , well, + τήκειν , melt, fuse, > τηκτός , molten, di olved (> τηκτικός, able to di olve).] I. a . Fusing easily; solidifying at a low temperature: specifically applied by Guthrie to a mixture of substances in such proportions that the fusing point is lower than that of either of the constituents themselves. Alloys are regarded as eutectic compounds, and the same principles apply to the mixtures of fused silicates of which volcanic gla , slags, etc., are formed. Metallic alloys are true homologues of the cryohydrates; the ratios in which metals unite to form the alloy po e ing the lowest melting-point are never atomic ratios, and when metals do unite in atomic ratios the alloy produced is never eutectic, i. e. having a minimum solidifying point, Thus pure cast-iron is not a carbide of iron, but an eutec tic alloy of carbon and iron. Similar hyper chemical ma ratios are found to exist among anhydrous salts; when one IMG:content-0812.jpg:[blocks in formation] Po es Po e ing right symmetry; metry: having having such a re lati on of parts that the one half is like the im age of the other in a mirror. While the mean lines lie in the plane of symmetry, the planes of the optic axes for different colours may be perpendicular to this plane. In this case the stauroscopic figure is of course euthysymmetrical to the trace of the plane of symmetry. Spottiswoode, Polarisation, p. 112. euthysymmetrically (ū"thi-si-met'ri-kal-i), adr. In a euthysymmetrical manner. The first mean line for each color may lie in the plane containing the oblique axes of the system. The planes containing the optic axes may lie in this plane. In this case the trace of this plane divides euthysymmetrically the stauroscopic figure. Spottiswoode , Polarisation, p. 112.