diaheliotropism

[Gr. dia =through, acro helios =the sun; tropē =a turning, and Eng. suff. - ism.] A movement of plants in a transverse direction to the light. "Diaheliotropism may expre a position more or le transvest i to light, and induced by it."- Darwin : Movement of Plants , p. 5. IMG:content-2391.png:[blocks in formation] 1. An instrument for showing the time of day by the sun's shadow. It is evident that the dial hav ing a gnomon which makes with the horizontal plane an angle equal to the latitude of the place is the invention of the Asiatics. When Ahaz went to Damascus to greet his benefactor, about 771 В. С., he saw a beautiful altar, and sent working draw. ings of it to Urijah, the priest in Jerusalem like altar was completed against his return. He likewise set up the dial which is mentioned in the account of the miraculous cure of his son Hezekiah, thirteen years after the death of Ahaz. This is perhaps the first dial on record, and is 140 years berbahasand nearly 400 years before Aristotle be to Thales and near little previous to the lunar eclipses observed at Babylon, as recorded by Ptol eclipse observe rio us construction, according to the presentation of the plane of the dial. IMG:content-2392.png:[blocks in formation] IMG:content-2393.jpg:[ocr errors] IMG:content-2394.jpg:[ocr errors][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed] *1. Ord. Lang.: To measure with or upon a dial. "Hours of that true time which is dialled in heaven." Talfourd . 2. Min .: To survey by means of a dial. di-al-dāne, s . [Pref. di ; Eng. ald ( ol ), and suff. -ane .] action of hydrochloric acid and two molecules of Chem.: C8H14O3. A compound obtained by the alcohol, CH3CH(OH)-CH2-COOH, a molecule of water being liberated. Dialdane di olves in boil- ing water, and crystallizes out in cooling in brilliant scales, which melt at 139°. It is only slightly solu- ble in ether. Its aqueous solution reduces silver di-al-dăn-Ic, a. [Eng. dialdan ( e ); suff. -ic .] dialdanic acid, s . CH-CH2-CH(OH)CH3 monobasic acid, obtained by heating an aqueous solution of dialdane with silver oxide, or by the action of pota ium permanganate at ordinary temperatures, and is obtained in a free state by de- composing the silver salt with H2S. It is soluble in water, alcohol, and ether. It forms large color- le monoclinic crystals, which melt at 80° and boil at 198°. It forms crystalline salts. di-a-lěct, s . [Fr. dialecte , from Lat. dialect us = a manner of speaking; Gr. dialektos discourse, speech, dialect; dialegomai =to discourse, to speak.] [DIALOGUE.] "And then he drew a dial from his poke." Shakesp.: As You Like It , ii. 7. For the difference between dialect and language , see LANGUAGE. dialect. *dī -a-lěct, v . t. [DIALECT, 8.] To speak in a "By corruption of speech they false dialect and mi e- sound it."-Nashe: Lenten Stuff. IMG:content-2395.png:[blocks in formation] 3. Logical, argumentative; pertaining to logic. "In mere dialectical skill he had very few superiors."- dial-lock, s. A lock provided with one or more dials, having a series of letters or figures on them. Each dial has a hand or pointer connected by a spindle with a wheel inside the lock; on the wheel tions; as, the Dialectic Society. Macaulay : Hist . Eng ., ch. xiv. 4. Designed for the study of philosophical ques- B. As subst.: [DIALECTICS.] di-a-lěc-tic-al-ly, adv . [Eng. dialectical ; -ly.] 1. In manner of a dialect; as regards dialect; in IMG:content-2396.png:[blocks in formation] mons, vol. iv., ser. 1. di-a-lěc-ti-cian, s. [Eng. dialectic ; -ian.] One skilled in dialectics; a logician, a reasoner. "Let us see if doctors or dialecticians Will dare to dispute my definitions." principles to discursive reasoning. By Plato it was used in the following senses: (1) Discu ion by dialogue, as a method of scien- tific investigation. (2) A method of investigating truth by analysis. of being. (3) The science of ideas, or of nature and the law doctrine of demonstration and scientific deduction. 2. The logic of probabilities, as opposed to the II. Of the form dialectic: these arise from accident or error, or from those 1. The logic of appearances or illusions, whether nece ary limitations which originate in the con- stitution of the human intellect. As logical or formal, it treats of the sources of error or illusion and their destruction: as transcendental, it is the exposure of that natural error or illusion arising from human reason itself, which is ever inclined to look upon phenomena as things in themselves, and cognitions a prior i as properties adhering to these things, and in such way to form the super-sensible, according to this a umed cognition of things in themselves. ( Ogilvie , .) 2. The method of di ecting, dividing, sub-dividing, and analyzing a subject, so as to ascertain the proper arguments by which to investigate, attack, or de- fend it. †di-a-lec-tol-o-ger, s. [Gr. dialektos =...a dialect; logos a discourse, and Eng. suff. -er .] One who studies or is skilled in dialectology. of English dialect." -Athenœum , April 23, 1881. "The county presents to the dialectologer two varieties IMG:content-2397.png:[graphic] IMG:content-2398.png:[blocks in formation] IMG:content-2399.jpg:[blocks in formation] 2. Min .: A non-aluminous variety of pyroxene; color grayish-green to bright gra -green; luster of cleavage surface pearly, sometimes metalloidal or bra y. Hardne , 4; specific gravity, 3-2-3-35. Com- mon, especially in serpentine rocks. (1) Metalloidal diallage : Min.: The same as ENSTATITE (q. v.). (2) Green diallage : Min.: The same as SMARAGDITE (q. v.). di-al-lag-ic, a . [Eng. diallag ( e ); -ic.] Pertain- ing to or formed of diallage. diallagic-augite, diallagoid-augite, s. A form of pyroxene intermediate in character between augite and diallage. Its sections can be dist in- guished from ordinary augite by the occurrence of straight and parallel fi ures or str iæ, which, in the longitudinal sections of the crystals, cro the coarser cleavage planes at angles from 70 to 90°. The mineral is not dichroic, and polarizes in strong colors, the crystal sections sometimes presenting iris-colored margins. IMG:content-2400.jpg:[blocks in formation] diallogite