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. (U. S. P.) 



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



