238 MATER i A MEDIC A AND THERAPEUTICS. 



Indigo C S H 5 NO. A blue pigment prepared 

 from various species of Indigofera. From India. 

 Use. Indigo is employed in chemical testing. 



ROSACE2E. 



Rosae Gallicae Petala RED ROSE PETALS. 

 The fresh and dried unexpanded petals of Rosa 

 gallica. From plants cultivated in Britain. 



Characters. Colour fine purplish-red, retained after dry- 

 ing ; taste bitterish, feebly acid, and astringent ; odour roseate, 

 developed by drying. 



Composition. Red-rose petals contain an aromatic oil, 

 tannic and gallic acids, gum, colouring matters, salts, etc. 

 Oleum roses exists in very small quantity ; it consists of an 

 aromatic oxygenated eloeoptin, and an odourless solid rose- 

 camphor. 



Preparations. 



1. Confectio Rosse Gallicae. 1 of fresh petals in 4. Dose, 30 



to 60 gr. 



2. Infusum Rosa Acidum. 1 of dried petals in 40 of diluted 



sulphuric acid and water. Dose, 1 to 2 fl.oz. 



3. Syrupus Rosas. 1 of dried petals in 17j. Dose, 1 to 2 



fl.dr. 



Rosae Centifoliae Petala CABBAGE ROSE 

 PETALS. The fresh petals, fully expanded, of Rosa 

 centifolia. From plants cultivated in Britain. 



Characters. Taste sweetish, bitter, and faintly astringent ; 

 odour roseate ; both readily imparted to water. 



Preparation. 

 Aqua Rossa. 1 in 1 by distillation. Dose, 1 to 2 fl.oz. 



ACTION AND USES. 



The preparations of the red and the cabbage rose are 

 chiefly used as pleasant vehicles. The acid infusion is an 

 agreeable astringent. 



Rosae Caiiiiiae Friictiis- FRUIT OF THE DOG 



