The proviso (sec. 61) "that only one registration at one fee shall be required in the case of several volumes of the same book deposited at the same time" indicates that one copyright entry suffices for several volumes simultaneously published, but each separate volume should contain the notice. Volumes published separately, not only in successive years but at successive dates within the year, should be separately registered, and if published separately in successive years, must each bear its copyright notice for the year of publication--this being the direct sequence from the provision that copyright runs from the specific date of publication and not from the year or date of registration. The Copyright Office will, however, under the law, register for one fee volumes or parts deposited at the same time, though published at various times. In the case of a book issued in successive parts, of which only the first part includes a title-page or title headings, the law is not specific; but it seems probable that, in default of copyright notice and registration for each part, the parts not bearing copyright notice might be legally reprinted, and that the safer course is to place the copyright notice on the first page of each part and register each part separately, in which case the completed work should have the date or dates of the year or years within which the several parts were published. There seem to be no objections, within the law or from court decisions, to coupling two dates in the same notice, in such cases as "Copyright, 1910, 1911, by A. B.," though there is no specific decision on this point. Under the previous law a book published in more than one volume or part, the portions not complete in themselves, was probably protected by copyright entry of the first part, all parts being of course ultimately deposited; but the change in the new code basing copyright on publication with notice, seems to change this rule of practice. In the case of Dwight _v._ Appleton, in 1840, it was held that as the statute did not expressly prescribe that the copyright notice should appear in successive volumes after the first, this was not necessary; but the application of this doubtful decision under the new code would be more than questionable. {Sidenote: Notice part of initial step} It may be emphasized that publication with notice is the first step in copyright under the new code, and that registration on deposit is the secondary and completing act, and therefore that no registry in the Copyright Office is necessary to authorize the printing of the copyright notice, as was formerly the case. {Sidenote: Extraterritorial notice}