The distribution of the list to other libraries was not, at first, contemplated. The printing of the subject headings was undertaken to facilitate the work of the catalogers in the Library of Congress, and it was believed that, if supplied to other libraries in its preliminary form, the list would give rise to many queries in regard to unavoidable omissions and inconsistencies. It had not progressed far, however, before many libraries intimated that it would be useful to them to receive the letters as they were issued, and when requests became too urgent for refusal, it was decided to supply copies at a price insuring that only those libraries should order them which had serious use for them. It was considered that 50 copies for distribution outside the Library of Congress would surely be sufficient, but it turned out that the estimate was too small, and, in consequence, there has had to be much reprinting of the early letters of the alphabet. The edition of the letter P, just issued, was 500 copies. The scope of the list of headings is largely inclusive in its character, covering subjects in all branches of knowledge as far as they have been adopted in the Library of Congress catalog. The names of persons and places are, however, omitted, also names of societies, institutions, and bodies of various kinds, names of treaties and conventions, and systematic names of genera and species in botany and zoology. The classes theology, and military and naval science are only partially represented in the list, as these sections are not yet re-cataloged. The classes language, literature, and philology, which are now in the process of recataloging, are more fully, but not yet wholly, represented. In the earlier letters of the alphabet, few headings in law were introduced (as it has only been during the past few months that the law headings have been systematically considered), but they are now included in the list, and many of those omitted in the earlier letters are being entered in the lists of additions to the subject headings issued in connection with the main list. We include in the list the more important subdivisions under a subject. These subdivisions are printed in italics, and separated from the main subject by a dash. One point to which I would especially call the attention of librarians using the list is that ordinarily only those subdivisions are printed under a subject which are distinctive, or peculiar to that subject. General form subdivisions, such as Directories, Periodicals, Societies, etc., which may properly be used under any subject requiring them, are, as a rule, omitted from the list. (A list of these form subdivisions can be found on p. 19 of the "Preliminary list of subject subdivisions," issued by the library in 1910.) Under names of countries only the history subdivisions are included.