Lt. Col. Llewellyn A. Brown (U.S. Army) will speak at the University tomorrow night at 8:30 in the auditorium of the New Chemistry Building. Sponsored by the University Young Republican Club, the talk will be on "Capitalism - Economic Black Power." Col. Brown is a highly successful "black capitalist" whose story has been celebrated in recent articles of "Business Week" and "Barron's." While a pilot in Vietnam, he made $21,000 in the stock market.