Arizona republican., 1914-06-20
Justice Lamar's Memoran- dunn to Emilio Rabasa, Head of Mexican Delega- tion, is Ultimatum of the United States
CARRANZA SPLIT
 MAKES NO CHANGE
Just What Will Be the Pol icy of the United States in the Event Mediation Fails is Not Known by Press Correspondents
IAssocIATEp PRESS DIsPATcHl

A
 NIAGARA FALLS, June 19.-Jus j. tice Lamars memorandum to Emilio Rabasa. head of the Mexican delega- tion. announcing that the United States must insist on acceptance of it's plan fo" the pacification of Mexico, is an ultimatum. Unless the Huerta delegates yield, mediation will end tomorrow or Sunday. This formal determination of the United states was conveyed to the medi- ators today.
 Ambassador Da Cana, of Brazil, and Minister Suarez, of Chile, asked the American delegates if their po- sition had changed in view of the Carranza- Villa split, and the .'eplT was in the negative It was an in formal talk. but it served to advise the mediators that the published statements that the American and Huerta delegates. with their opposite view on the type of a man to be selected for provisional president, de- fined the unalterable attitude Of the American government. Just what the policy of the United States would be in the event of the failure of mediation, or what disposition It would make of the American troops at Vera Cruz is unknown even to the American delegates.
 The Huecta commissioners say they do not know what course of action Huerta may pursue. Those conversant with the American view point. however. believe the president is determined that, inas much as there could not be pacification Ill Mexico unless the constitutionalists accepted any plan that might be adopted here, the interests of peace will not be conserved by the con- tinuance of the mediation negotia tions
 The meliators held no formal ses sion today, because Minister Naon, of Argentine stopped in Washington instead of returning directly from the universities where he had been receiving honorary degrees. Naon is expected back early tomorrow.
 The rejection by the Americans of the mediators' plan as well as that offered by the Mexican delegates will be recorded as d matter of form. together with the disapproval by the Mexicans of the American plan. Automatically that would adjourn the conference, according to the rules of procedure adopted when they first convened
 The report from Mexico City that Huerta had decided to appoint Pedro Lascurain to the present vacancy in the portfolio of minister of foreign affairs may change the aspect of things if it develops that Lascurain IS to be made provisional president irrespective of the mediation pro- ceedings. Rabasa, head of the Mexi- can delegation, said he thought it improbable that this would occur.
 Lascurain was minister of foreign affairs under Madero and at his overthrow became provisional presi- dent. He appointed Huerta to his cabinet and then relinqushed the presidency to Hue-ta. Many conSti- tutionalists have explained that while the constitutional order will be re- stored of MT. Lascurain became pro- visional president, they opposed his elevation to that post because of his unresisting subsercieney to Gen eral Huerta's assumtion
 There are man here who believe. however, that the American govern ment might be persuaded to accept Lascurain as provisional president pending an election and a more def mite understanding with the con- stitutionalists. The appointment of Lascurain it is believed there, would merely bridge the difficulty which the transfer of the executive power to the new govrnmnt and would not