Vol. XVII AUOUSX 15, 1919 No. 5 



JOURNAL OF 



AGRICUIvTURAL 



RESEARCH 



CONXKNXS 



Page 



Derds as an Insecticide ------- 177 



N. E. McINDOO, A. F. SIEVERS, and W. S. ABBOTT 



(Contribution from Bureau of Entomology) 



Effects of Heat on Trichinae ------ 201 



B. H. RANSOM and BENJAMIN SCHWARTZ 

 (Contribution from Bureau of Animal Industry) 



Effect of Removing the Pulp from Camphor Seed on Germi- 

 nation and the Subsequent Growth of the Seedlings - 223 



G. A. RUSSELL 

 (Contribution from Bureau of Plant Industry) 



Bacterium abortus Infection of Bulls - - - - 239 



J. M. BUCK, G. T. CREECH, and H. H. LADSON 



(Contribution from Bureau of Animal Industry) 



PUBUSHED BY AUTHORITY OF THE SECRETARY OF AGRICULTURE, 



WITH THE COOPERATION OF THE ASSOCIATION OF AMERICAN 



AGRICULTURAL COLLEGES AND EXPERIMENT STATIONS 



WASHINOTON, D. C. 



WASHINOTON : QOVERNMENT PRINTINQ OFFICE : III* 



