The “CO-FE-CU” fluids and certain pharmacopœial tests**Scientific Section, A. PH. A., Madison meeting, 1933.††The work described in this paper was performed at the request of Dr. George D. Beal, chairman of the U. S. P. sub-committee on organic chemicals. Our thanks are due to the Abbott Laboratories, Mallinckrodt Chemical Works, Merck & Company, New York Quinine and Chemical Works, Charles Pfizer & Co. and E. R. Squibb and Sons, for samples of the chemicals studied and to Messrs. armao, Brown, Cooper, D'Orazio, Ginsberg, Givens, Glockner, Héiko, Hoehler, Isacoff, Kleinsinger, Sher, Silver, Vigilante, Wight and Ziliotto, fourth-year students of Columbia University College of Pharmacy, for the preliminary work upon which our final standards were based. [A. and T.]