Under the present ruling of the post office department, all unclaimed copies of periodicals are immediately destroyed, unless a forwarding order from the addressee is on file. It is therefore advisable that subscribers to our periodicals inform us in advance of any contemplated change in address; or, if this is not practicable, a forwarding address should be left with the local post office, that there may be no loss of our periodicals through non-delivery. The request for change of address should give both the old and new address and the name, of each periodical for which change is desired.