THE AXES OF ROTATION OF THE EYEBALL

(FROM RANNEY, AFTER FICK.) ‘The heavy lines show the direction of the muscles; the dotted Ilnes, the axes of rotatlon, AAs tho eye i reprenented as seep from above, the a, of rotation of the éxternal and internal not shown, Ger., Beckenachse, Achse (oder mittellinte oder Führungslinie) der Beckenhöhle, Führungslinie des Geburtsproce es. Syn.: guiding line. A curved line cutting all the median antero-posterior diameters of the pelvic canal at their centres. The a. of any particular part of the pelvis cuts the centre of the plane of that part at right angles. [A, 22, 23.] Cf. Curve of Carus.—A. of turning. See A. of rotation.—A. optic us. See Optic a—A. pelvis. See ‘A. of the pelvis—A. plantæ. Ger., Pflanzenachse. The a, of a plant; the upper and underground stems, [B, 213.]—A. primarius. See Primary a— A.-proce . See A.-cylinder proce . — A. procumbens. See Procumbent a.— A. sol- See Solvent a. — A.- under ACHSE, — A.-tractio See under Traction, — A.- tube. See A.-cylinder—A. uteri. 1, The long diameter of the uterus. 2. An imaginar transverse line pa ing throu; the uterus at a point near the junction of its body with its neck, on which it is said to turn when it becomes anteverted or retroverted.—Band a. See A.- cylinder —Bare a.-eylinder. See Naked a.-cylinder.—Basicranial a. A line running from the centre of the anterior margin of the foramen magnum to the centre of the anterior margin of the cerebral surface of the sphenoid bone; as often used, a collective term for the bas i occipital, bas i-sphenoid, and pre sphenoid bones. (L, 142, 149, 158.] —Basi-facial a. The forward continuation of the bas i-cranial a., extending to the foremost point of the alveolar margin of the superior maxilla; as often used, a collective term for the narrowed anterior end of the pre sphenoid ‘bone, the vertical plate of the ethmoid, and the septal cartilage of the nose. [L, 142, 149, 153.]—Biauricular a. Fr., axe bi-auricula ire. An imaginary straight line running from one auricular point to the other. [Bertillon (L, CO Brachy-diagonal a. In crystals of the triclinic and the rhombic systems, the shorter of the two secondary axes. [B, 3.] See A. of jatallization.—Brain-a. The isthmus cerebri. [E. C. Spitzka, “Med. Record,” Oct. 11, 1884, p. 393 (K).}-Bulb-a. In botany? a short, conical, leaf-bearing subterranean a.; a bulb. [B. 75.J— Central a. See A.-cylinder.—Cerebro-spinal a. Lat., a. cerebro- (seu encephalo-) spinal is. Fr., axe cérébro-spinal. Ger., Gehirnrückenmarksachse. It., a e cerebro-spinale. Sp.… eje cerebroespinal. The central nervous system; the brain and the spinal cord. [K.]—Chief a. See Principal a.—Clinodiagonal a. In crystals of the monoclinic system, that one of the secondary axes which makes an oblique ‘angle with the principal a. [B, 3.J See A. of crystallization—Cœliac a. See Cœliuc aRTERY.— Corneal axes. The axes of the ellipsoid of which the cornea is a segment. [F.]—Cranio-facial a. In comparative anatomy, the bones which form the floor of the cranial cavity, including the mes ethmoid, the vomeric, the pre sphenoid, the bas i-sphenoid, and the bas i-occipital. [C; L, 153.]—Cranio-spinal a. See Cerebro-spinal a.—Crystal log rap hie a. See A. of crystallization.—Decumbent a. t., a. decumbens. Fr., axe décombant. Ger., niederliegende Achse. It., a e decombante. A stem which, after rising some distance above the ground, descends and trails upon the ground. [B. 34.]—Definite a. Fr., axe défini. A plant-a. which is terminated by a flower and then ceases to eae longitudinally, the growth of the plant being carried on on! y by secondary axes which spring from the axils of the leaves of the primary a. and. after attaining a certain growth, also cease extending longitudinally, and give rise in their turn to tertiary axes of axillary origin. 1B, 121.|—Descending a. Lat.,a. descend ens. Fr. axe descend ante. Ger., hinabsteigende Achse, In botany, the root; that portion of the a. of a plant which lies habitually beneath the ground, and is distinguished by the presence of fibrillæ (absorbing