group of late 19tth century chicago privy-dug bromo seltzer diminutive cobalt blue glass squat neck medicinal bottles designed and fabricated by or for the emerson drug company, baltimore, md. the lot of matching mouth-blown dug bottles likely were fabricated around 1890. the cork stoppered bottles contain horizontal embossed lettering on the front or face. the cobalt blue glass bottles with beaded lips were mouth-blown in cup-bottom molds and contain numbers along the bases (after 1907 the bottle bases contained the letter "m" within a circle. by 1915, bromo seltzer bottles were made by machine and the cork closure disappeared by 1928 when the bottles were sealed with metal caps. the antacid (containing acetaminophen, sodium bicarbonate, and citric acid) was developed and trademarked in 1889 by isaac e. emerson of the emerson drug company. the distinctive blue bottles were first mouth-blown beginning in the 1890's up until 1907 by the cumberland glass company of bridgeton, nj. from 1907 onward, the bottles were produced by the maryland glass corporation baltimore, md., which was established solely to produce these bottles for the emerson drug company. bromo-seltzer is sold in the united states in the form of effervescent granules which must be mixed with water before ingestion. in the days of classic radio, it was known for its slogan which was repeated rhythmically in imitation of a railroad steam engine: "bro-mo-selt-zer, bro-mo-selt-zer, ..." there is also a clock tower in baltimore, maryland, known as the bromo-seltzer tower, and has the name written on the face of the clock in lieu of the hours. patterned on the palazzo vecchio in florence, italy, it is listed on the national register of historic places. the product took its name from a component of the original formula, sodium bromide; it contained 3.2 meq/teaspoon of this active ingredient. bromides are a class of tranquilizers that were withdrawn from the american market in 1975 due to their toxicity. their sedative effect probably accounted for bromo-seltzer's popularity as a hangover remedy. priced for the lot. measure 4 inches high.