In September 1775 Congress had created the Secret Committee to supervise the export and import of vital materials required for the war. Licenses to leave port were given shipmasters on the condition that they would return with vital military stores. Under this dispensation, American ships set out for Europe, Africa, and the West Indies in search of essential supplies.[99] Many months were required, however, to establish such importation as a significant source of supply, and this was especially true with regard to medical supplies. The delay in initiating importation can hardly be charged as the only or even the main reason for medical supply shortages in 1776. For example, in August of that year, when at least a half-dozen medical supply officers were pleading for drugs from Congress in Philadelphia, John Thomson of Petersburg, Virginia, advertised that he had for sale "Rhubarb and Jalap, Glauber and Epsom Salts, Jesuits Bark" and a host of other supplies.[100] Whether or not Thomson's supplies constituted any significant amount, the very fact that he had to advertise them indicates a lack of coordination and communication between those urgently seeking supplies and those selling them. Even more frustrating were those suppliers right under Congress's nose advertising essential drugs. Suppliers like Dr. Anthony Yeldall at "his Medicinal Ware-House" were still advertising "Bark, Camphire, Rhubarb, &c" in July of '76.[101] Philadelphia was second only to New York for Loyalists, and Yeldall was later proven to be a strong Tory. Then there were those who were neither Patriot nor Loyalist; they were just indifferent to the cause for American independence, and thus insisted on cash, even though six months' credit was the common practice just prior to the war. In 1771 in Philadelphia one druggist regularly gave a 15 percent discount on all purchases if paid within six months and 7-1/2 percent discount was allowed for payments between six and nine months, but interest was expected on all debts over a year's standing.[102] The business-minded members of Congress tried to follow prewar methods by seeking credit. Merchants who sold on credit found that, when they finally were paid, they received paper money backed only by a promise to exchange for gold and silver at some future time. Furthermore, they were caught in a spiraling inflation, and often found that when they finally received their money from Congress it then would cost them twice as much to replenish their stocks. Medical supply officers therefore found it necessary to pay ready cash for merchandise out of their own pocket, and sometimes they had to wait six months for reimbursement from Congress.