HELIOTROPISM

n. Hel'i'-oH'ro'p-Pzm. Lat., heliotropism us (from ijAios, the sun, and rpoirri. a turning). Fr., helio trop is me. Ger., Heliotropism us. The state of being heliotropic. [B, 229 (o, 24).] Animal h. Lat., heliolropismus animal is. Fr., helio trop is me animal. Ger., thierischer Heliotropism us. The instinct po e ed by animals which enables them to recognize their situation and to direct their movements with reference to the source of light. ["Rev. des sci. med.." Oct. 15, 1888, p. 428 (a, 18).] Negative h. Fr., helitropisme negatif. Ger., negativer Heliotropism us. In plants, the property of turning away from the light; in animals, the instinct by which the anal extremity is directed toward the source of light. [B, 229 (a, 24); " Rev. des sci. med.," Oct. 15, 1888, p. 428 (a, 18).] Positive li. Fr., helio trop is me positif. Ger., positiver Heliotropism us. In plants, the property of turning toward the light; in animals, the instinct by which the mouth and ventral aspect are directed toward the source of light. [B, 221 (a. 24): "Rev. des. sci. med.," Oct. 15, 1888, p. 428 (o, 18).]-Transverse h. Of Frank, a sort of heliotropic irritability peculiar to dorsiventral organs of plants by virtue of which such organs exhibit a strong tendency to a ume a horizontal position when exposed to vertical light. [Vines (a. 35).] HELIOTROPIUMlLat), n. n. Hel(hal)-ia-o(o3)-trop(tro'lp)'i1'- u*m(u4m). Gr.. ijAiorpoirioi' (from TJAKK. the sun. and Tporr/, a turning). Heliotrope, turnsole; a genus of the Boraainece. The //// - tropene, or Heli liotro|>ii. The leaves of H. europa-um. [B, 180 (a. 24).] H. iirop;i-iuii. Kr.. hi-liiitrnpc i'. iiirnmil, her be mi OiiZ (OB O1t cfccmCTM, Otl ".' r.-rn/rxi tonnii'xol. ivrnirairr. Ger., gemeine Sonnenwcnde, Krebsblume, Hcr}>ionskniut, Wtn-zE, he; E, ell; G, go: I, die; 1", in; N, iii; >, tank; [s. 302]