No. 3, December, 1920] PATHOLOGY 183 



mum uplift. The curve indicates an incoming flora, the present flora of Western Europe 

 which first appeared in the Miocene. Only part of it has survived, the destruction becoming 



greater after the Middle Pliocene. [From author's abstract of a paper read at a meeting 

 of the Geological Society.] — H. II. Chun. 



L253. ScHLAFFNEB, H. Die geographischen Bedingungen der Moorbildung in Deutsch- 

 land. [The geographical conditions of moor formation in Germany.] Xcue Munchener geogr. 

 Studicn. 1. 47 p. 1920. 



1254. Stutzer, O. Uber Methoden der mikroskopischer Kohlenuntersuchung. [Upon 

 methods of microscopic coal investigation.] Mikrokosmos. Zeits. angewandte Mikroskopie. 

 1919-1920. Hft. 6: 132-134. 



1255. Werth, A. J. Die wichtigsten Moor- und Torf-arten und ihre Entstehung in Ver- 

 gangenheit und Gegenwart. [The important moor and peat species and their origin in the past 

 and the present.] Mitt. Ver. Ford. Moorkultur. 38: 46-51, 59-64. 1920. 



PATHOLOGY 



G. H. Coons, Editor 

 C. W. Bennett, Assistant Editor 



1256. Adams, J. F. Rusts on conifers in Pennsylvania. Pennsylvania Agric. Exp. Sta. 

 Bull. 160. 30 p., 10 fig. (1919) 1920— See Bot. Absts. 6,vEntry 1213. 



1257. Anonymous. Insects and diseases which injure trees. Amer. Forestry 26: 308-309. 

 1920. — Contains formulae and general directions. — Chas. H. Otis. 



1258. Anonymous. The menace of silver leaf. Jour. Bd. Agric. [London] 25: 870-S71. 

 1918. — Silver leaf is reported as becoming increasingly serious to orchard trees. Valuable 

 varieties of plum, like Victoria, are threatened with extinction. "By promptly cutting out 

 silvered branches and by rigorously removing all dead tree, or trees which have begun to die 

 back, it has been proved in practice that the spread of the disease is checked." — D. Reddick. 



1259. Atwood, Alice C. Errors in Lindau's "Thesaurus" and Saccardo's "Sylloge." 

 Mycologia 12: 169-171. 1920. 



1260. Bailey, M. A. Puccinia malvacearum and the mycoplasm theory. Ann. Botany 

 34: 173-200. April, 1920.— See Bot, Absts. 6, Entry 774. 



1261. Calvino, Mario. El zacate prodigio. (Tripsacum latifolium, Hitchcock.) [A 

 forage plant.] Revist. Agric. Com. y Trab. 3 : 62-67. 6 fig. 1920. 



1262. Campbell, C. Su di un caso di invasione di ruggine nera dei cereali "Puccinia 

 graminis Pers." in Terra di Lavoro. [An invasion of the black rust of cereals in Terra di Lavoro.] 

 Atti R. Accad. Lincei Rend. (CI. Sci. Fis. Mat. e Nat.) 28 1 : 142-145. 1919— In 1913 in a re- 

 stricted area in Atina, wheat was found so severely attacked by rust as to practically a total 

 failure. A leaf rust classed as Puccinia rubigovera (P. triticina) is commonly present in this 

 region but causes little damage and does not attack the barberries. The severe attack in 

 question was found to have three centers lying about or on the windward side on barberry 

 plantings. All the barberries were removed in 1913 except one plant; in 1914 the rust appeared 

 only in the vicinity of this plant. With the destruction of the remaining barberry in 1914, 

 the rust has not reappeared from 1915 to the present date. The introduction of P. graminis 

 was attributed to experimental plantings of wheat in this neighborhood. — F. M. Blodgett. 



1263. Carpenter, C. W. Potato diseases in Hawaii and their control. Hawaii Agric. 

 Exp. Sta. Bull. 45. 42 p. 15 pi., 7 fig. 1920.— A brief description of the more important 

 potato diseases, including insect enemies, together with a discussion of the control measures 



