Hartley'* Brcecb-XaAdluir Cauuou.■ A now breech-loading o tin non lias been irmntiid by Meagre. R, W. Uaiwlky and R. R„ Moffatt, uf La 0 rosso ta tills State, which was patented on the 29ili djij of Alignst which i« Baid by many whohave examined It tc bo a very great improvement upon anything of the kind heretofore! pn ten ted. 1 Mr. James M. Loom* ib ia now td tljo city with one of thane gana, and will givo an exhibition of Its merits in theOzjpitol Pork to-morrow afternoon at nbont two c^clock, for lIjg benefit of the member a of the Legislature nnd stch others as de-ire to witness the exhibition, It has been thoroughly tested by the officers in Camp Douglas at Chicago, and pronounced “a very serviceable and effective arm for military purpose*.” ft hns been discharged Jfty times in four minvtes, without being gcnnibly heated.