Vol XVI MARCH 3, 1919 No. 9 



JOURNAL QP 



AGRICULTURAL 

 RESEARCH 



CONXE^NXS 



Pa«e 



Two Species of Pegbmyia Mining the Leaves of Dock - 229 



S. W. FROST 



( Contribution from Cornell Agricultural Ezperimeat Station ) 



Influence of Foreign Pollen on the Development of Vanilla 



Fruits - - - - - - > - - 245 



T, B. McClelland 



(Contribution from States Relations Service) 



A Blood>Destro3ring Substance in Ascaris Lumbricoides - 253 



BENJAMIN SCHWARTZ 



( Contribution from Bureau of Animal Industry ) 



PUBLISHED BY ADTHORITY OF THE SECRETARY OF AGRICTJITDRE, 



WITH THE COOPERATION OF THE ASSOCIATION OF AMERICAN 



AGRICULTURAL COLLEGES AND EXPERIMENT STATIONS 



WA.SMINGTON, r>. C. 



WASHINaTON : OOVERHMENT POIKTINa OFFICE ; ItIS 



