120 The American Naturalist. [February, 



In the map accompanying this paper the dotted line marked 

 Cer. border, indicates approximately the boundaries of the 

 Ctratops 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 en- 

 camped at the mouth of Schneider Creek on the Cheyenne 

 River, would doubtless meet with much success. The map 

 explains itself; it was drawn by the writer to accompany his 

 paper on the Ceratopsbeds 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. 



RECENT LITERATURE. 



Recent Books on Vegetable Pathology.— (1) Kirchner, Dr 



Oskar: I He Krankheiten mui Bwhmliguiigen iinsenr h,n<b> irttrhnjt 

 lichen Kalturpjkmsen. Stuttgart, 1890, pp. VI, 637 ; (2) Comes, Dr, 

 O.: Crittogamia Agraria. Naples, 1891, pp. 600; (3) Ward, Dr. H 

 Marshall : Diseases of Plants. London, (no date), pp. 196 ; (4) Lud 

 wig, Dr. Friedrich : Lehrbuch der niederen Kryptogamen. Stuttgart, 

 1892, pp. XV, 672; (5) Tubeuf, Dr. Karl Freiherr von: Pfianzen 

 'urrh Knjptognme Pant.-iten eerursacht. Berlin, 1895, pp, 

 XII, 599; (6) Frank, Dr. A. B.: Die Krankheiten der Pfianzen. 

 Breslau, 1895-1896, Vol. 1, pp. XII, 344; Vol. II, pp. X[, 574; (7) 

 Prillieux, Ed. : Maladies des Plantes agrieoles et des arbres fruitiers et 

 forestiers cause par des parasites vegetaux. 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. 



