12 



ENTOMOLOGICAL NEWS 



[Jan., '15 



plants in their natural position. Cage 3 contained six bars to 

 each of which six plants were tied with the leaves of adjacent 

 plants in contact. Cage 4 contained twelve bars each with 



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4 5 



Diagrams showing Distribution of Vegetation in Cages 1-5. 



twelve plants, with one of the whorl of three leaves overlap- 

 ping that of the next plant. Cage 5 was packed with plants 

 so that no bars were necessary. 



In order to make a quantitative measure of the material 

 which afforded the shelter, both plants and wire bars were 

 placed in a graduate partly filled with water. The rise of the 

 water was then noted and the records are given below. 



Cage 2, containing 3 bars with 3 plants each, displaced 50 cc. 

 water. 



Cage 3, containing 6 bars with 6 plants each, displaced 135 

 cc. water. 



Cage 4, containing 12 bars with 12 plants each, displaced 

 355 cc. water. 



Cage 5, packed with plants, displaced 915 cc. water. 



