168 BiBLlOaRAPfllOAL NOTES. D. P yuccsefolia, sp. n. Stem shrubby, branched, stout. Leaves crowded at the end of the branches, ensiform, acuminate, stiff and coriaceous, 15 in. long and 1 in. wide, striate. Panicle large, spreading, with numerous slender pubescent branches. Bracts | in. long, lanceolate, acuminate. Mowers very small, i in. long, scattered on the branches, almost sessile ; pedicels very short, pubescent. Perianth-tube turbinate, glabrous ; lobes oblong, obtuse, free almost to the base. Stamens a little shorter ; filaments adnate to the base of the tube, flattened, dilate above, red. Anthers oblong, obtuse, dorsifixed. Pistil shorter; ovary oblong, triquetrous, truncate. Style cylindric. Stigma dilate, capitate. Siam, at Ghirbee, on limestone rocks (Curtis, no. 2935). The leaves resemble those of some Yucca rather than those of a DraccBna. The large spreading panicle with pubescent branches, the small turbinate white flowers and triquetrous ovary, and stamens adnate to the base of the flower, make it a very distinct plant. BIBLIOGRAPHICAL NOTES. X. — The Dating and Indexing of Periodicals. The suggestions made on these matters [Journ. Bot. 1894, 180, 271) have been in so many cases acted upon that I venture to raise one or two more points connected with the subject. When I referred with approval {I. c. 181) to the Bidletm of the Torrey Botanical Club as giving the date at the head of each number, I said, *' This appears not easy to carry out, but Dr. Britton has somehow overcome the difficulty." I am now doubtful as to how far this date is to be accepted as strictly accurate. The dates of issue for the last three numbers have been Nov. 30th, Dec. 30th, Jan. 30th. Each issue contains three sheets, and the date appears on the first of these. It seems to me that unless the possibility of accidental delay has in some way been entirely removed, it is not easy to guarantee that a number thus dated should have been printed, stitched, and wrapped by the exact day named. When the date is printed on the cover, as in the case of the Botanical Gazette, the possibilities of such accidents are reduced to a mini- mum, and now that these dates are reprinted in the index to the volumes of that periodical, I see no better plan than this. The practical bearing of this point will very shortly become manifest. The Supplement to the Index Kewensis will include all plants published up to the end of 1895. Should the species published in the Torrey Club Bulletm dated Dec. 30th, 1895, be included— i. e. have we sufficient guarantee that this number was actually published on that date ? . In relation to this, the case of the Bulletin of Miscellaneous Information J published in connection with Kew Gardens, may be noticed. Thanks to the Stationery Office, as previously pointed out
