The Marshall Oill Trust.The following letter from the Marshall Oil company to the Halbur firm speaks for itself. People who believed that the Standard is the trust and all other not oppressors will be interested in the disclosure herein made.Marshalltown, Iowa, June 19, ’Oo. Mr. F. Dalhoff, Halbur, Iowa,Dear Sir:—Is it true that you are selling our Roseine Oil at 14 cents? While we are not particular whether you sell this oil at 18c or 20c we do not care to have it sold at 14c, as this injures the reputation of the oil. Any future orders we accept from you will be accepted with the understanding that the oil is not to be sold at low prices.Yours very truly, Marshall Oil companyPer G. H. Ruth.