These are very pretty bottles. For many years, I wondered myself what they contained. Here is an 1890 ad which gives the details. According to the ad, the product was first put on the market in this country in 1866 and sold as Hoff's Malt Extract by one Leopold Hoff. In 1868 the business was "transferred" to Joseph S. Pedersen, hence the JSP monogram. Apparently the next year the product became property of Tarrant & Company.