\ EARTHY fLUOR. 229 octahedral fltior, without in the least disturbing its crys tallization. Observations. The erroneous analysis of the Earthy Phosphorite of Marmarosch by Pelletier, by which it appeared to con tain 28 per cent, of fluoric acid, has led several authors _ to confound it with the earthy fluor. Vti XXIV.