THE. U. S. P. AND N. F. COMPOUND POWDER 135 



Aggregate crystals (calomel) present . . Pulv. Hydrarg. et Jalap. (N. F.) 



Prismatic crystals present Pulv. Jalap. Co. (U. S. P.) 



TISSUE ELEMENTS AND FORMED CELL CONTENTS WANTING 



..Abundant dark, nearly black particles Pulv. Antimon. (N. F.) 



. . No black particles 



Very minute crystalline particles Pulv. Cret. Co. (U. S. P.) 



.... Abundant larger crystals, soluble and insoluble in water 



Crystals by the micro-sublimation test 



Abundant water insoluble prismatic crystals. . . .Pulv. Talc. Co. (N. F.) 



Crystals largely water soluble, angles rounded. .Pulv. Antisept. (N. F.) 



No crystals by sublimation 



Large lined and ridged crystals Pulv. Acetan. Co. (N. F.) 



, Crystals largely water soluble 



(soda and potass, salts) Pulv. Eff. Co. (U. S. P.) 



Crystals soon soluble (tartaric acid) Pulv. Eff. Co. (IT. S. P.) 



. . . .Abundant minute granules and larger crystals. .Pulv. Pancreat. Co. (N. F.) 



