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56 THE CONDOR ]VOL. VIII sorted somewhat as to subjects and authors. The volumes are numbered consec- utively and the papers of each volume are numbered. Any paper is found by means of a card index giving number of volume and number of paper. If a vol- ume contains papers by one or a few authors their names may be printed on the back, as well as the general subject treated in the volume, and at the bbttom the name of owner. The first three volumes of such a series might haye backs marked as follows: MEXICAN EVOLUTION FISHES BIRDS I 2 3 ]3rewster Cope ]vermaJt Nelson .for da n G ar ma ?t A?idgwa 9, Gill SMITH SMITH SMITH This method commends itself by reason of the facts, that the papers are well protected, a volume is not so easily mislaid as a small pamphlet, and the pages having been cut in binding, are more easily run thru in order to locate a given paragraph. This method is more expensive than the first, but the greater con- venience is well worth the additional cost. I have given the two systems a pretty thoro test side by side, working with one set of papers bound and another equal number of papers unbound, and for convenience the bound volume is away ahead of the bunch of loose papers. I hope the above notes will call forth additional remarks on the subject. dk[anila, P. I. FIKOM FIELD AND STUDY Birds Whose Notes Are Imitated by the Western l?tlockingbird.--For the past three years I have nmde observations on the song of the western mockingbird in the vicinity of Pasa- dena and find in every instance that they imitate the commonest aud most noisy birds of the locality. A striking proof of this was noted on Santa Catalina Island in the early part of last April. The western flycatcher was very numerous and in full soug and as a result the mocking- birds of the Islaud were imitating it freely, something I have never known a mainland mocking- bird to do. In addition to the notes of other birds, the mockingbird utters several scolding notes which are strictly its own, but these are seldom heard in the regular song. There are quite a number of notes which I have been unable to place as yet. However, I think the following list will con- vey an approximate idea of the birds mimicked by ?imuspolygloltos leucoplerus in this region. Western gull (Santa Catalina Island), killdeer, valley partridge, sparrow hawk, Califoruia woodpecker, red-shafted flicker, ash-throated flycatcher, Say phoebe, black phoebe, western wood pewee, western flycatcher (Santa Catalina Island); California jay, western meadowlark, Arizona hooded oriole, Bullock oriole, Brewer blackbird, San Diego song sparrow, black-headed gros- beak, western tanager, western martin, cliff swallow, phainopepla, California shrike, western gnatcatcher, dwarf hermit thrush, western robin.--C. H. RICHARDSON, Jr., Pasadena, ?hl.