6 



A number of samples of oil will be sent out by the referee to the vari- 

 ous chemists to be tested 



1. By the method in use in the respective laboratories. 



2. By the cloud test as given by Dr. Manns. 



3. By the cold test of the Pennsylvania Railroad as modified by 

 Millwood. 



4. In regard to the other points at issue as far as is practicable. 



Report of the results should be sent to the referee as soon as possible, 

 as this is only a preliminary investigation. In the report make any 

 suggestions or criticisms that may seem pertinent. 



Approved : 



JAMES WILSON, 



Secretary of Agriculture. 



WASHINGTON, D. C., February 5, 1906. 



O 



