1850 0826 — Charles Stillman → Davis & Co. (San Luis Potosí)

By late August 1850, Charles Stillman’s correspondence shows not only the mechanics of trade, but his growing role as a commercial observer and intermediary. Writing to Davis & Co. in San Luis Potosí, Stillman acknowledges receipt of funds and then turns to something more revealing: a candid assessment of market conditions along the Rio Grande. The letter captures a moment when goods, credit, and information moved together—and when success depended as much on timing and supply as on transportation.

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Original Letter (English — clean transcription)

Brownsville, Augt. 26th, 1850

Messrs. Davis & Co.
San Luis Potosí

Gentlemen,

We are in receipt of your favor of the 18th ult., advising us of your instructions to Messrs. Chs. Stillman & Co. to balance payment to us of $881.53, being the balance of your account, the same was received on the 22nd instant and entered accordingly.

Business is rather flat with us at present, though our market is well assorted with clients’ first hands at 9½¢. English bagging 11½¢ to 14¢. English iron 9½¢.

Large quantities of goods have left this for the interior within the last three months; that place is well assorted for the fall, and as we have a new collector for Matamoros and Camargo, it is to be feared that as favorable entries cannot hereafter be made.

We are,
Your obt. servts.,
Chas. Stillman & Bro.

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Reading Between the Lines

This letter moves beyond simple bookkeeping and offers a rare snapshot of market conditions on the Rio Grande in 1850. Stillman begins by confirming receipt of $881.53, carefully noting its application to Davis & Co.’s account—evidence of the precise accounting practices that underpinned long-distance trade. But the real value of the letter lies in what follows.

“Business is rather flat,” he writes, a striking admission that the market in Brownsville was temporarily subdued. Yet this is not a sign of weakness. On the contrary, Stillman notes that the market is “well assorted,” stocked with goods from “first hands”—that is, directly from primary suppliers. He even provides price points: cotton goods, English bagging, and iron, all staples of frontier commerce. This is not casual correspondence; it is price reporting, the kind of information merchants depended on to make decisions hundreds of miles away.

More revealing still is his observation that “large quantities of goods have left this for the interior within the last three months.” This single line tells us that Brownsville was already functioning as a distribution hub, channeling imported goods deep into northern Mexico. The trade network was not confined to the border—it extended inland, feeding regional markets like San Luis Potosí itself.

But the most important passage comes at the end. Stillman notes the appointment of a new customs collector at Matamoros and Camargo, and expresses concern that “as favorable entries cannot hereafter be made.” This is a subtle but critical insight. Profit in this system did not depend solely on supply and demand—it also depended on customs practices, duties, and enforcement. A change in personnel could alter the entire balance of trade.

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A Market Defined by Movement and Risk

What emerges from this letter is a picture of a commercial system that is already dynamic and interconnected. Goods move rapidly from the coast to the interior. Prices fluctuate. Markets fill and empty. And above all, the system is sensitive—not just to economic forces, but to administrative decisions made at customs houses along the river.

Stillman is not merely shipping goods. He is watching the market, measuring its rhythms, and warning his partners of changes that could affect their profits.

The river carried more than cargo.
It carried information.
And in 1850, those who understood both were already ahead.