Number of seed left for 



Substance used in Per cent different mice 

 treatment of seed Mouse House Mouse House 



left 7 8 9 10 



#150 treated and 1JO untreated seed were 

 each day fed. All were Douglas fir seed, "but 

 two different lots 7/ere used. In one lot a 

 count of 500 seed showed 105 out of 150 had 

 kernels. This lot was used where the # is not 

 given. The othe^ lot had 97 good seed out of 

 150 and this was used where a # is given after 

 the figure. 



It is thought that the test was severe and that 

 where 40^ or 50^ of the treated seed were eaten in the 

 cage that few or none would have been touched in the field. 

 This is merely a supposition based upon the following facts : 

 The mouse was in each case confined to a small space; he 

 was underfed; the treated seed was easier to reach than the 

 untreated seed in the cage. 



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