ROLLER 



1276 



ROSACEOUS 



Roller {ro'-ler) [ME., rolle, a roll]. A long strip of 

 cloth varying from one to six inches or more in width, 

 made, for convenience, into a cylindric roll. 



Rollet, Delomorphous Cells of. See Delomorphous. 



Roman Ocher. Same as Ocher. R. Theory, of 

 Marchiafava and Celli, as to the nature of the crescentic 

 forms of the parasites found in the blood of malarial 

 patients. According to this theory, the crescents are 

 sterile forms and do not reproduce new bodies. Man- 

 naberg's theory considers them as conjugation -forms, or 

 syzygies. See Syzygies. R. White. Same as White 

 Lead. 



Romberg's Sign or Symptom. The increased inco- 

 ordination of movement in tabes caused by placing the 

 feet in juxtaposition and closing the eyes. It is also 

 called the Brack- Romberg Symptom. See Signs and 

 Symptoms, Table of. 



Romershausen's Eye-water. A wash frequently 

 employed in chronic ophthalmic catarrh. It is a mix- 

 ture of fennel water and tincture of fennel. 



Rontgen Rays. See X-Rays. 



Root [ME., roote, root]. The place of origin of. 

 a nerve ; the proximal and cutaneous end of a hair ; 

 the intra-alveolar portion of a tooth. The base of an 

 organ. See Radix. In biology, the descending axis 

 of a plant, originating in the radicle of the embryo. 

 It fixes the plant in the soil and absorbs nutrition. It 

 differs from a stem in producing no buds or branches. 

 Rs., Aerial or Adventitious, those springing from 

 the stem above ground for climbing or bracing pur- 

 poses, .£ .g., ivy, corn. R., Anterior {of the auditory 

 nerve), the root of the auditory nerve arising from the 

 large-celled auditory nucleus. R., Anterior (of the 

 zygoma), a ridge passing from the temporal portion of 

 the zygoma to the squamous portion of the temporal 

 bone. R., Antero-lateral (of the optic tract), that 

 strand of fibers arising from the optic thalamus and 

 passing through the geniculate body. R., Ascend- 

 ing (of the auditory nerve), those fibers of the auditory 

 nerve which arise from the median line of the oblongata 

 (Roller). R., Ascending (of the fifth nerve), those 

 fibers of the sensory root of the fifth nerve which have 

 their origin in a group of cells in the gelatinous sub- 

 stance of the medulla. R., Brazil, an old name for 

 Ipecac. R.-cap, a mass of tissue that covers like a 

 helmet the growing-point of every root. R., Deep 

 (of the auditory nerve) . See j^. , Anterior (of the 

 auditory nerve). R., Descending (of the fifth nerve), 

 those fibers of the motor root of the fifth nerve having 

 their origin in the gray substance of the aqueduct of 

 Sylvius. R., External (of the olfactory nerve), those 

 fibers of the olfactory nerve which have their origin 

 in the insula. R. -fillings, fillings of different ma- 

 terials inserted into the pulp-canals of the teeth. R.- 

 form, applied to that form of an insect, if it has two 

 forms, which it assumes when infesting roots, as in 

 Phylloxera vastalrix, the grape-vine pest. R., Gray 

 (of the olfactory nerve) . See R. , Middle (of the olfactoiy 

 nerve). R. -hairs, slender filaments growing from the 

 epidermis of the younger roots which increase the power 

 of absorption. R., Inferior Auditory, the posterior of 

 the two roots which unite to form the auditory nerve. 

 R.-leaf. Same as radicle leaf ; apparently springing 

 from the root, but really from a short stem. R. -louse. 

 See Phylloxera and Schizoneura. R.-neck (Collet), the 

 point of union between the root and the stem of a plant, 

 or where the radicle and the plumule of the embryo unite. 

 R. -parasite, a plant parasitic upon the root of another. 

 R. -pressure, in biology, a force exerted in plants by 

 which the water absorbed from the soil by the roots in 

 greater quantity than required drives the sap up the 

 stem. R. -sheath, the thick layer of tissue covering 



the radicle of grasses, etc., and which is ruptured on 

 germination ; it is called also Coleorhiza. R. -sheath 

 (of hair), the epithelium of the hair-follicle. R.- 

 stock, in biology, (i) a rhizome ; (2) a cormus or 

 rhizocaulus. R. -symptoms (of Cowers), in com- 

 pression of the spinal cord. The functions of the 

 nerve-roots are interfered with at the level of the mor- 

 bid process. A second class of coexistent symptoms 

 are denominated by Cowers as Cord-symptoms, and 

 consist in interference with the function of the cord 

 itself. R. -trimmer, an instrument for shaping and 

 reducing the roots of natural teeth in crown and bridge 

 work. R.-zone, a name given to the columns of 

 Burdach in the spinal cord. 



Rootlet [Dan., rod, a root]. A little root. 



Roquefort Cheese. See Cheese. 



Rorulent (ro f -ru-lent) \rorulentus, full of dew]. In 

 biology, covered with a powdery bloom. 



Rosa (ro'-zah) [~L.,gen.,rosic~\. A genus of the family 

 rosacea, the rose. R. Acidum, Infus. (B. P.) Dose 

 ^j-ij. R., Aqua, pale rose 40, water 200 parts, 

 mixed and distilled. R., Aq., Ung., cold cream ; 

 oil of almond 50, spermaceti, white wax aa 10, rost- 

 water 30 parts. A useful emollient. R. Caninaj 

 Confectio (B. P.) Dose 3J-ij. R. canina, the dog- 

 rose, a European plant four to eight feet high. Rosa; 

 caninae, Fructus. Hips. These are the enlarged calyx- 

 tubes, not the fruit. They have a sweet, acidulous, 

 rather astringent taste, and are inodorous. For medic- 

 inal use, the fleshy calyx-tube is employed, the akenes 

 being removed. The pulp contains malic and citric 

 acids. Confectio rosae caninae, prepared from hips 

 R. centifolia, pale rose ; hundred-leaved rose, prob- 

 ably a native of Western Asia, but cultivated in all 

 countries. The petals alone are used, and are roundish 

 obovate, pink in color, having a delicious odor, due to 

 a volatile oil, and a sweetish, rather bitter and astrin- 

 gent taste. The chief constituents are tannin, fat, 

 resin, sugar, mucilage, a bitter principle, malates, tan- 

 nates, phosphates, and a coloring-matter. The petals 

 are used in the distillation of Aqua roses, and dried in 

 preparing Syrupus sarsaparillcB cotnp. R., Confectio, 

 red rose 8, sugar 64, honey 12, rose-water 16 parts. 

 A basis for pills. R.,Damascena. See Attar of Rose. 

 R., Ext., Fid. Dose VC\x-%\\. R. gallica, red 

 rose ; rose rouge. A native of Southern Europe and 

 the Levant, but extensively cultivated. The buds are 

 collected, the petals cut off near the base and rapidly 

 dried. The chemic constituents are nearly identical 

 with those of pale rose. Confectio rosae, red rose 8 

 parts, sugar 64, honey 12, rose-water 16 parts, 

 as a basis for pills. Infus. rosae acidum, dried red 

 rose petals broken up x / 2 troy -ounce, diluted sulphuric 

 acid 1 fluidram, boiling distilled water 10 fluid 

 ounces. Infuse in a covered vessel for half an hour 

 and strain. Extr. rosae fluid., red rose in N 

 powder 100 gm. , glycerin 10 gm., dilute alcohol l>> 

 make 100 c. c. Pack the mixture in a percolator, 

 and add enough of the menstruum to saturate the 

 powder and leave a stratum above. Used in | 

 and mouth-washes. Syrupus rosae, made froi 

 fluid extract. Mel rosae, honey of rose. Red 

 in No. 140 powder 8 parts, clarified honey 92 | 

 dilute alcohol, a sufficient quantity to make 200 | 

 R. solis ("Rose of the sun "), a cordial or //" 

 flavored with cassia bark and orange- flower ■ 

 Rosoglio. 



Rosacea (ro-za'-se-ah). See Acne rosacea. 



Rosaceous (ro-za'-she-us) [row, a rose]. Rose-like • 

 rose-red. In biology, a term descriptive 

 that have five spreading, clawless, or short-clawe 

 als, as the flowers of the apple, rose, etc. 



