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Vol. XXV, No. 9 
in the head under the conditions of the experiment. Varieties which 
developed head infection were greatly reduced in yield. 
Leaf infection in the seedling stage has been more severe in spring- 
sown wheat. Leaf infection at heading time has been more severe in 
fall-sown wheat. 
Several varieties have proved very resistant to the strains of the rust 
studied. Resistance is evidenced by the development of large areas of 
killed tissue in the portions of the leaves inoculated, followed by the 
production of few or no uredinia. 
Dark brown blotches and browning around the edges of inoculated 
areas have developed upon certain grass hosts. This characteristic ap¬ 
pears to be specific for certain grasses and has not been considered a 
general sign of resistance. 
Telia have been formed in the greenhouse in a few cases under certain 
conditions. This was thought to be due to the conditions surrounding 
the host and was not regarded as a sign of resistance. 
LITERATURE CITED 
(1) Biffen, R. H. 
1905. MENDEL’s laws OP INHERITANCE AND WHEAT BREEDING. In Jour. 
Agr. ScL, v. 1, p. 4-48, 2 pi. Bibliographical footnotes. 
(2) CARLET0N, M. A. 
1915. a serious new wheat rust in this country. In Science, n. s., v. 
,, _ „ 42, p. 58-59- 
(3) Comes, O. 
1914. DELLA RESISTENZA DEI PRUMENTI ALLE RUGGINI, ED IN GENERALE DELLE 
PIANTE ALLE LORO CAUSE NEMICHE. In Ann. R. Scuola Sup. Agr. 
Portici, ser. 2, v. 12, p. 419-473. Bibliographical footnotes. 
(4) Eriksson, Jakob. 
1894. UEBER DIE SPECIALISIERUNG DES PARASITISMUS BEl DEN GETREIDEROST- 
pilzen. In Ber. Deut. Bot. Gesell., Bd. 12, p. 292-331. Literatur- 
verzeichnis, p. 330-331. 
(5) --and Henning, Ernst. 
1896. die getreideroste . . . 463 p., 5 fig., 13 col. pi. Stockholm. Litera- 
turverzeichnis, p. 446-457. 
(6) Hayes, H. K., Parker, John H., and KurtzwEil, Carl. 
1920. genetics op rust resistance in crosses op varieties op triticum 
VULGARE WITH VARIETIES OP T. DURUM AND T. DICOCCUM. In Jour. 
Agr. Research, v. 19, p. 523-542, pi. 97-102. Literature cited, p. 
541-542. 
(7) Hecke, L. 
1915. ZUR PRAGE DER UBERWINTERUNG DES GELBROSTES UND DAS ZUSTANDE- 
kommen von rostjahren. In Naturw. Ztschr. Forst. u. Landw., 
Jahrg. 13, p. 213-220. 
(8) Henning, Ernst. 
1919. anteckningar om gulrosten (puccinia glumarum). In K. Landbr. 
Akad. Handl. och Tidskr., arg. 58, p. 4(71-418,1 pi. (Reprinted with 
Bygd6n, A. Bestamingar av aciditet och sockerhalt i vattenextrakt 
av vetesorter med olika resistens mot gulrost, as Meddel, n:r 192 
Centralanst. F6rs6ksv. Jordbr. Bot. Avdeln. n:r 16, 25 p., 1 pi. 1919). 
(9) HiltnEr, L- 
1914. NEUERE BEOBACHTUNGEN ttBER DEN ROSTBEPALL DES WINTERGE- 
TREiDES. In Prakt. Bl. Pflanzenbau u. Schutz., Jahrg. 17 (12), p. 
81-84. 
(10) HungerPord, C. W. 
1923. STUDIES ON THE LIFE HISTORY OP STRIPE RUST, PUCCINIA GLUMARUM 
(schm.) Erik S 3 , and henn. In Jour. Agr. Research, v. 24, p. 607- 
620, 1 fig., 4 pi. Literature cited, p. 620. 
(11) Jenkin, T. J., and Sampson, Kathleen. 
1921. rust resistance trials with wheat. In Bui. Welsh Plant Breeding 
Sta., Ser. C., no. 1, p. 41-49* 
