Sss 



U. S. DEPARTMENT OF AGRICULTURE. 



OFFICE OF EXPERIMENT STATIONS— BULLETIN NO. 168. 



A. C. TRUE, Dire< tor. 



THi: STATI' KXCIXKKR AND HIS HKLATION TO 



IKKKiATION. 



BY 



H. w ti:kle, 



EXPEKT IN luKKiATION I NSTITITION.S. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE, 



1906. 



