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Show Preservation of Thoroughfares. K' Washington Preservation of the ' thoroughfare In tho Yellow stono Nn- llonal pirk Irn subject to which tho nrmy engineer having charge nro glv- I Ing a good deal of attention It I a I considerable problem fur tho reason l that the work of sprinkling tn order ( to prevent disintegration Is nn oxpen- she task, tho cost now being nbout j $300 000 for rprlnkllng perhaps nnt I morn than ion mile of road Thern J lie been some tnlli or using oil, but this Is necessarily exinnlve and b there la eonaldernbln doubt of this method of treating the roads |