Glacial phosphoric acid (Metaphosphoric acid, H 2 OP 2 O 5 or HPO3). Preparation , Triturations of the acid obtained by the method of Hahnemann. Authorities. (Nos. 1 to 14 , from Hahnemann, Chr. Kr.). 1 , Hahnemann; 2 , Becher; 3 , Franz; 4 , Gross; 5 , Gutmann; 6 , Fr. Hahnemann; 7 , Herrmann; 8 , Hartmann; 9 , Langhammer; 10 , Meyer; 11 , Stapf; 12 , Teuthorn; 13 , Wislicenus; 14 , Hering; 15 , Herinigke, A. H. Z., 79, 157, proving with the 3d cent. dil., two or three doses daily, for seven days; 16 , Schelling, proving with the 12th dil., three times a day, A. H. Z., 84, 43; 17 , Robinson, proving with the 1000th dil., a dose every third morning, Br. J. of Hom., 25, 327; 18 , Andrews, experiment on self, beginning with 20 drops of acid and increasing the dose to 4 drachms, Am. J. of Insanity, 1869, p. 113; 19 , Dr. G. Gale, manuscript, proving with the 30th dil. (from Dr. Farrington, of Philadelphia).