Thayer's Letter Much Discuussed

Chicago, May 6.- The lettor oí Comniander J. S. Thayur. of the departraent of Massachusetts, recently issued to the posts under his coinmund, referriug to the declication ot' tho Confedérate monument at Oakwoods on Decoratiou Day, is oauaing considerable comment and uot alittle excitement in Grand Army circlcs in this city. There is a great difference of opinión in regard to the matter, and the war is being tought over again most vigorously.