No. 2, March, 1921] PATHOLOGY 171 



amylovorus). Empoasca mali and Lygus pratensis were shown to be carriers. "So far as early 

 spring distribution is concerned, ants, honey-bees, click-beetles, apple aphis, and bark beetles 

 are incriminated. Of the click-beetles, Cardiophorus fenestralus was observed commonly 

 on the stumps of pear trees which had been cut down for blight and was seen to be feeding 

 on blight exudate." — /. W. Eastham. 



1147. TuBEUF, C. V. Riickinfection mit Peridermium pini (Cronartium asclepiadeum) 

 von der Schlangenwurz auf die Kiefer. [Infection with Peridermium pini (Cronartium ascle- 

 piadeum) from snake root to the pine.] Naturwiss. Zeitschr. Forst- u. Landw. 18: 99-101. 

 1920. — Infection was secured on the green shoot and primary needles of 2-year old pine seed- 

 lings with teliospores from Cynanchnm vincetoxicum in August of 1915. At the end of Sep- 

 tember, 1919, the region beneath the lowest whorl of one of the pines was swollen and covered 

 around with yellow bead-like pycnidial masses. The three upper internodes showed no 

 infection. — /. Roeser. 



1148. Wartenweiler, A. Zur Biologic der Gattung Plasmopara. [Biology of the genus P.] 

 Verhandl. Schweiz. Naturf. Gesell. 99: 223-224. 1918.— Abstract in Zeitschr. Pflanzenkr. 30: 

 24. 1920. 



1149. WoBER, A. Die fungizide Wirkung der verschiedenen Metalle gegen Plasmopara 

 viticola Berl. et de Toni und ihre Stellung im periodischen System der Elemente. [Fungicidal 

 action of different metals on Plasmopara viticola.] Zeitschr. Pflanzenkrankh. 30: 51-59. 

 1920. 



THE HOST (RESISTANCE, SUSCEPTIBILITY; MORBID ANATOMY AND 



PHYSIOLOGY) 



1150. Anonymous. The red coloring matter of plant galls. [Rev. of: M. Nierenstein. 

 Trans. Chem. Soc. 1919 (cxv) : 1328-1332.] Nature 104:707. 1920.— See Hot. Absts. 7, 

 Entry 408. 



1151. Bailey, C. H., and A. M. Gurjar. Respiration of cereal plants and grains. V. 

 Notes on the respiration of wheat plants affected with stem rust. Jour. Biol. Chem. 44: 17-18. 

 1920. — The rate of respiration of the infected plants was materially lower than that of the 

 sound plants. — G. B. Riggs. 



1152. Bertrand, Gabriel. Action de la chloropicrine sur les plantes superieures. [The 

 effect of chloropicrine on the higher plants.] Compt. Rend. Acad. Sci. Paris 170:8.58-860. 

 1920.— See Bot. Absts. 7, Entry 438. 



1153. Boodle, L. A. The scorching of foliage by sea-winds. Jour. Ministry Agric. 

 Great Britain 27: 479-486. 1920.— A theoretical discussion of some of the literature bearing 

 on the subject from which the general conclusion reached is "that the scorching of foliage 

 by sea-winds is chieflj' due to the drying action of the wind, but that salt may perhaps occa- 

 sionally contribute towards the production of an injurious effect." — M. B. McKay. 



1154. Brick, C. Die Widerstandsfahigkeit gewisser Sorten unserer Kulturpflanzen 

 gegen Parasiten. [The resistance of certain varieties of our cultivated plants to parasites.] 

 Naturwiss. Wochenschr. 18:391-394. 1919.— Susceptibility of plants to diseases is not due 

 to degeneration, old age, and other similar causes enumerated by practical horticulturists, 

 but usually is the result of certain differences in morphological or anatomical structures of 

 the host itself. The increased acid and sugar content or tannin also have a bearing upon the 

 resistance of a variety to parasites. Some plants escape because their season of blossoming 

 or maturimg does not coincide with the development of the parasitic organism. These state- 

 ments are supported by citations of literature dealing with susceptibility and resistance to 

 Tilletia iritici, Ustilago tritici, U. nuda, Puccinia glumarum, P. triticina, P. graminis, P. 



