UNITED STATES DEPARTMENT OP AGRICULTURE 

 BULLETIN No. 391 



Contribution from the Borean of CIieniiBtry 

 CABL L. ALSBERG, Chief 



Washington, D. G. 



PROFESSIONAL PAPER 



December 10, 1918 



ACCURACY IN COMMERCIAL GRADING 

 OF OPENED EGGS 



By 



M. E. JENKINS, Assistant Bacteriologist, and 



NORMAN HENDRICESON, Assistant Chemist, 



Food Research Laboratory 



CONTENTS 



Page 



Introdnction 1 



Purpose, Plan, and Extent of Investiga- 

 tion 2 



History and Bacterial Content of Samples 4 

 Effect of Condition of Shell on Bacterial 



Content of Egg . 6 



Relation between Number of Bacteria 

 and Physical Condition of the Egg 

 Contents 11 



Descriptions and Bacterial Connfs of 



Eggs Graded out of the Shell .... 14 



Effect of Contaminated Elggs apon Com» 



posite Products 18 



Eggs Rejected during Grading .... 21 



Summary ............ 25 



WASHINGTON 



GOVERNMENT PRINTING OFFICE 



1918 



