data is not for publication 

 without consent of the Forest 

 Service. ) 



SS D-6 



Columbia - Studies 



Nursery Experiments. 



RODENTS AND FIELD SOWING 



By C. P. Willis 

 November 19, 1912. 

 ---o--- 



The study was started on the T/ena tehee National 

 Forest after observing serious injuries to seed spots by 

 rodents boring into them and eating the seed sown. A se- 

 ries of tests was carried on on this Forest with the ain 

 of obtaining some substance so repulsive to white-footed 

 mice that seed treated v/ith it would not be molested when 

 sown in the field. Mice were kept in captivity for the 

 tests, and were fed untreated and treated seed each day. 

 The following is the summary of these tests: 



Wenatchee Tests with Gaged Ilice (See file copy of prog- 

 ress report. ) 



The following table shows the substances test- 

 ed with white-footed mice, and the value of each accord- 

 ing to percentage of good seed left untouched. 



