. Journal of Agricultural Research. Journal of Agricultural Research Washington, D. C. r PLATE 4Platygaster vernalis: A.—Adult female. B.—Frontal view of head of adult. C—Antenna of male. JD.—Antenna of female. ADDITIONAL COPIES OF THIS PUBLICATION MAY BE PROCURED FROM THE SUPERINTENDENT OF DOCUMENTS GOVERNMENT PRINTING OFFICE WASHINGTON, D. C. AT lo CENTS PER COPYSubscription Price, $ Per Year PURCHASER AGREES NOT TO RESELL OR DISTRIBUTE THISCOPY FOR PROFIT.—PUB. RES. 57, APPROVED MAY II, 1922 JOWAL OF AGRlCDLTlffiAl RESEARCH Vol. XXV Washington, D, C, July 14, 1923 No. 2 TRANSMISSION, VA

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. Journal of Agricultural Research. Journal of Agricultural Research Washington, D. C. r PLATE 4Platygaster vernalis: A.—Adult female. B.—Frontal view of head of adult. C—Antenna of male. JD.—Antenna of female. ADDITIONAL COPIES OF THIS PUBLICATION MAY BE PROCURED FROM THE SUPERINTENDENT OF DOCUMENTS GOVERNMENT PRINTING OFFICE WASHINGTON, D. C. AT lo CENTS PER COPYSubscription Price, $ Per Year PURCHASER AGREES NOT TO RESELL OR DISTRIBUTE THISCOPY FOR PROFIT.—PUB. RES. 57, APPROVED MAY II, 1922 JOWAL OF AGRlCDLTlffiAl RESEARCH Vol. XXV Washington, D, C, July 14, 1923 No. 2 TRANSMISSION, VARIATION, AND CONTROL OF CER-TAIN DEGENERATION DISEASES OF IRISH POTA-TOES^ By E. S. ScHXTLTZ, Pathologist, Cotton, Truck, and Forage Crop Disease Invesiigaiions,Bureau of Plant Industry, United States Department of Agriculture, and DonaldFoLSOM, Plant Pathologist, Maine Agricultural Experiment Station INTRODUCTION Progress in solving the well-known problem of degeneration in theIrish potato, Solanum tuherosum L., has been

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