15 



These experiments appear to us to prove that beetles 

 work their way upwards on emergence ; secondly, that it 

 is to get relief from the weight of the seeds on top of them 

 that beetles move upwards. The presence of beetles in the 

 cylinders at the sides, B, C, E and F may appear to contradict 



Tia. 8, — Cylindrical tin box containing infested gram and having tubes inserted fts 

 described on page 14. 



the conclusion drawn. The few beetles found in these are, 

 however, those that have been deflected from their upward 

 movement by the diminished pressure among seeds in the 

 neighbourhood of the in3ertion of the cylinders. It will be 

 recalled that, at the commencement of the experiment, the- 

 seeds in these cylinders sloped and that therefore there 



