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In the map accompanying this paper the dotted line marked Cer. border, indicates approximately the boundaries of the Ceratops beds in Converse Co. The line to the south and east indicating the outcrop of the beds, that to the west the point where they pass under the overlying beds. They extend on uninterruptedly into Weston Co., but have not been worked farther north than Schneider Creek. A working party encamped at the mouth of Schneider Creek on the Cheyenne River, would doubtless meet with much success. explains itself; it was drawn by the writer to accompany his paper on the Ceratops beds above referred to, but was not then published. A copy of it was given by him to Professor Marsh and a portion of it redrawn, will appear in the 16th Annual Report of the U.S. Geological Survey accompanying a memoir by Professor Marsh.

Princeton, N. J., Jan. 6, 1896.

The map

RECENT LITERATURE.

Recent Books on Vegetable Pathology.-(1) Kirchner, Dr. Oskar: Die Krankheiten und Beschädigungen unserer landwirtschaftlichen Kulturpflanzen. Stuttgart, 1890, pp. VI, 637; (2) Comes, Dr. 0.: Crittogamia Agraria. Naples, 1891, pp. 600; (3) Ward, Dr. H. Marshall: Diseases of Plants. London, (no date), pp. 196; (4) Ludwig, Dr. Friedrich: Lehrbuch der niederen Kryptogamen. Stuttgart, 1892, pp. XV, 672; (5) Tubeuf, Dr. Karl Freiherr von: Pflanzenkrankheiten durch Kryptogame Parasiten verursacht. Berlin, 1895, pp. XII, 599; (6) Frank, Dr. A. B.: Die Krankheiten der Pflanzen. Breslau, 1895–1896, Vol. 1, pp. XII, 344; Vol. II, pp. XI, 574; (7) Prillieux, Ed. : Maladies des Plantes agricoles et des arbres fruitiers et forestiers causé par des parasites végétaux. Paris, 1895, Vol. I, pp. XVI, 421.

It is desired only to call attention to these books at this time by means of the briefest mention. Some have been published long enough to enable one to speak freely of their merits and demerits ; others are very recent additions to the literature of vegetable pathology and use has not yet demonstrated strong or weak points.

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Dr. Kirchner's book deals with diseases due both to animal and veg. etable parasites. Its statements are reasonably accurate and it is so arranged as to greatly facilitate identification of diseases. No illustrations.

Dr. Comes' book contains quite a full account of some parasitic diseases and brief mention of many others. It was the first book of its kind to pay much attention to bacterial diseases of plants. Its statements are frequently inaccurate and the 17 plates illustrating fungi and fungous diseases are poorly executed and add nothing to the value of the book.

Prof. Ward's little book is by far the best thing in English. It discusses only a few diseases and all of these in a very elementary, popular way, but there are many interesting suggestions, and the facts which are given are usually stated accurately. There are 53 text figures and a brief index. A book of about the same size and style by the same author, on Timber and Some of its Diseases, (1889) makes a good companion volume.

Dr. Ludwig's book is uneven in its make up, some parts being quite free from erroneous statements and others, those dealing presumably with the subjects least familiar to the author, needing careful revision. The book certainly deserves a second edition. From the pains taken to say something about everything, it is perhaps more generally useful than any of the preceding or than the following work.

Dr. Tubeuf's book is very attractive. The type is large and clear, and the unhackneyed character of the illustrations, many of which were prepared expressly for this work, is especially commendable. The treatment of certain subjects indicates that the author depended upon imperfect reviews rather than on the original papers, e. g., Wakker's bacterial disease of hyacinths, and Mayer's mosaic disease of tobacco; but the book as a whole has not been read carefully enough to warrant any extended criticism.

Dr. Frank's book is the second revised edition of his well known hand book, Die Krankheiten der Pflanzen, published in 1880, and now sadly out of date. Much new matter has been added and an earnest effort made to bring the subject up to date. This has succeeded as well, perhaps, as the rapidly growing state of the science will admit. The first volume deals with non-parasitic diseases ; the second with fungous parasites. Most of the figures appear to be old, and the letter press is indifferent.

Dr. Prillieux's book is attractive in appearance, but some of it is sketchy and rather unsatisfactory, and due credit is not always given. Quite often the reader finds himself wishing the author had stated some matter exactly rather than vaguely, e. g., germination of the cospores of Plasmopara viticola. Prillieux is probably right in maintaining that Viala has not satisfactorily determined the aetiology of Brunnisure and the California vine disease, the microscopic appearances ascribed to a Plasmodiophora being quite as likely due to the effect of strong reagents on the protoplasm of the cell. Some of the figures in this book are excellent, others are very poor. There is no index.

It is to be hoped that Dr. Sorauer will now bring out another edition of his Handbuch der Pflanzenkrankheiten, or at least of the 2nd volume on parasitic plants which was issued in 1886 and needs revision badly. All of these books are useful to American students, and should certainly find place on the book shelves of every vegetable pathologist. It would seem that the time is not ripe for the appearance of standard American works on this subject. There is, however, great activity in the study of plant diseases in this country, and we may look for a crop of them within the next decade.—Erwin F. SMITH.

The Iowa University Bahama Expedition. The history of an educational and scientific experiment is given Mr. C. C. Nutting in this octavo volume of 251 pages. It is published as Bulletins Nos. 1 and 2, Vol. III, of the laboratories of Natural History of the Iowa State University. The zoology of the region visited is treated of in a general way with a view to giving an idea of the facies of the collections from the several localities. The marine and land invertebrata are treated of quite fully, but none of the vertebrates receive much attention excepting the birds. The beauties of marine life are graphically described, and a considerable number of illustrations add to the general excellence of the get up of the book. An appendix gives a list of commissary stores actually used during the expedition.

Mr. Nutting, in summing up the results of the expedition, draws attention to the fact that this enterprise demonstrates the practicability of accomplishing such results at a cost which is merely nominal.

The Shrews of North America.”—The tenth number in the North American Fauna series published by the U. S. Department of Agriculture, contains three papers on the Shrews: A revision of the genera Blarina and Notiosorex by Dr. C. H. Merriam, a synopsis of the

1 The Bahama Expedition. Bulls. Nos. 1 and 2, Vol. III, Laboratories Nat. Hist. Iowa State Univ. Iowa City 1895.

2 Xorth American Fauna No. 10, Washington, 1895. Comprising papers by C. Hart Merriam and G. S. Miller, Jr.

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