NEW MODE of WASHING.—Messrs.TWELVETREES having devoted considerable attention to t^e improvement of their WASHING PREPARATION, have succeeded in producing an entirely new article, which is effectual in its results, and which is warranted not to Injure or corrode the finest fabric, as the following important testimony will show :—*• London, 24, Bloomsbury-square, 25th May, 1849.“ I have analyzed Twelvetrees' Improved Washing Preparation, and hereby certify that it is perfectly safe, and not In the least likely to corrode or injure Linens or Cottons washed with it by the Laundress. It is a very effectual detergent, and coincides in this respect with soap.“ANDREW URE, M.D., F.R.S., c. c., Professor of Chemistry, and Analytical Chemist.