. Journal of Agricultural Research. warf at left, and the double recessive in center. The brachytic and dwarf plantsare sibs from the second generation of the dwarf-brachytic hybrid, while the doublerecessive plant is from the third generation of this cross, having been obtained in aprogeny from a self-pollinated F^ brachytic plant which proved to be heterozygousfor dwarf. No such sharp distinction as is indicated in this picture was found in thesecond generation between dwarf and the double recessive. It is apparent that thedouble recessive form of this combination is much larger than the dou
. Journal of Agricultural Research. warf at left, and the double recessive in center. The brachytic and dwarf plantsare sibs from the second generation of the dwarf-brachytic hybrid, while the doublerecessive plant is from the third generation of this cross, having been obtained in aprogeny from a self-pollinated F^ brachytic plant which proved to be heterozygousfor dwarf. No such sharp distinction as is indicated in this picture was found in thesecond generation between dwarf and the double recessive. It is apparent that thedouble recessive form of this combination is much larger than the double recessiveanther ear dwarf figured by the Emersons. PLATE S Three liguleless maize plants from the second generation of the dwarf-brachytichybrid. At left, a dwarf liguleless; center, brachytic liguleless; right, a plant ofnormal stature with liguleless leaves. While these plants are from the Fo, theyapproximate closely the heights of the two parent variations and their Fj hybrid. Inheritance of Dwarfing in IVIaize Plate 5 -^Z^.. Journal of Agricultural Research Washington, D. C. DETERMINATION OF SULPHUR COMPOUNDS INDRY LIME-SULPHUR By Carleton Parker Jones Assistant Research Professor of Chemistry, Massachusetts A gricultural Experiment Station INTRODUCTION Lime-sulphur products and analogous substances, known as polysul-phids, have of recent years come into prominence because of their value asinsecticides and fungicides. Large quantities, especially of the lime-sulphur compound, are now manufactured. Correct and simple methodsare needed for the estimation of the principal constituents, both as a safe-guard to the producer and as a help to the entomologist and plant patholo-gist. METHODS IN USE Avery (2),^ working with sulphur dips, modified standard methods inorder to determine the total sulphur and total lime. NajS, resulting fromthe treatment of a dilute solution with NaOH, was oxidized by a largeexcess of medicinal H2O2. Haywood (6, 7), also modified standard methods in
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