IV Journal of Agricultural Research voi. xxii 



Page 



Notes on the Organic Acids of Pyrus coronaria, Rhus glabra, and 



Acer saccharum. Charles E. Sando and H. H. BartlETT. . . 221 



FertiHty in Shropshire Sheep. Elmer Roberts 231 



Relation of Soil Temperature and Other Factors to Onion Smut 



Infection. J. C. Walker and L. R. Jones (2 text figures; 3 



plates) 235 



A Physiological Study of Grapefruit Ripening and Storage. Lon 



A. Hawkins (i text figure) 263 



Absorption of Copper from the Soil by Potato Plants. F. C. 



Cook 281 



Pale Western Cutworm (Porosagrotis orthogonia Morr.) J. R. 



Parker, A. L. Strand, and H. L. Seamans (i text figure; 4 



plates) 289 



Biology of Embaphion muricatum. J. S. Wade and Adam H. 



Boving (3 text figures; 2 plates) 323 



Genetic Behavior of the Spelt Form in Crosses between Triticum 



spelta and Triticum sativum. Clyde E- LeighTy and Sarkis 



Boshnakian (3 text figm-es; i plate) 335 



Plum Blotch, a Disease of the Japanese Plum Caused by Phyllo- 



sticta congesta Heald and Wolf. John W. Roberts (2 text 



figures; i plate) 365 



A Comparison of the Pectinase Produced by Dififerent Species of 



Rhizopus. L. L. Harter and J. L. Weimer (2 text figures) .... 371 



Hemotoxins from Parasitic Worms. Benjamin Schwartz 379 



Ash Content of the Awn, Rachis, Palea, and Kernel of Barley 



during Growth and Maturation. Harry V. Harlan and 



Merritt N, Pope (5 text figures) 433 



Temperature Relations of Stone Fruit Fungi. Charles Brooks 



and J. S. CoolEy (24 text figures) 45 1 



Transportation Rots of Stone Fruits as Influenced by Orchard 



Spraying. CharlES Brooks and D. F. Fisher (6 text figures) . 467 

 Storage of Coniferous Tree Seed. C. R. Tillotson (2 text figures) . 479 

 Susceptibility of the Different Varieties of Sweet Potatoes to 



Decay by Rhizopus nigricans and Rhizopus tritici. L. L. 



Harter and J. L. Weimer 511 



Index 517 



