Oct. i, 1920-Mar. 15, 1921 Contents 



Effect of Various Crops Upon the Water Extract of a Typical Silty p age 

 Clay Loam Soil. G. R. Stewart and J. C. Martin 663 



Another Conidial Sclerospora of Philippine Maize. William H. 



Weston, Jr 669 



Onion Smudge. J. C. Walker 685 



Variations in Colletotrichum gloeosporioides. O. F. Burger 723 



A Transmissible Mosaic Disease of Lettuce. Ivan C. Jagger. . 737 



Leconte's Sawfly, an Enemy of Young Pines. William Middle- 

 ton 741 



Amylase of Rhizopus tritici, with a Consideration of Its Secretion 



and Action. L. L. Harter 761 



A Comparative Study of the Composition of the Sunflower and 

 Corn Plants at Different Stages of Growth. R. H. Shaw and 

 P. A. Wright 787 



Evaluation of Climatic Temperature Efficiency for the Ripening 



Processes in Sweetcorn. Charles O. Appleman and S.V. Eaton 795 



Some Lepidoptera Likely to Be Confused with the Pink Bollworm. 

 Carl Heinrich 807 



Biology of the Smartweed Borer, Pyrausta ainsliei Heinrich. 



George G. Ainslie and W. B. Cartwright 837 



Effect of X-Rays on Trichinae. Benjamin Schwartz 845 



Relation of the Calcium Content of Some Kansas Soils to the 

 Soil Reaction as Determined by the Electrometric Titration. 



C. O. Sw anson, W. L. Latshaw, and E. L. Tague 855 



Green Feed versus Antiseptics as a Preventive of Intestinal Dis- 

 orders of Growing Chicks. A. G. Philips, R. H. Carr, and 



D. C. Kennard 869 



Comparative Utilization of the Mineral Constituents in the Coty- 

 ledons of Bean Seedlings Grown in Soil and in Distilled Water. 



G. Davis Buckner 875 



Sunflower Silage Digestion Experiment with Cattle and Sheep. 



Ray E. Neidig, C. W. Hickman, and Robert S. Snyder 881 



Index 88q 



