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BROOKLYN BOTANIC GARDEN MEMOIRS 



normal plants were perfectly free from contact with one another and 

 (b) those in which the so-called normal plants were more or less in 

 contact with one another. Both of these normal series were compared 

 with those in direct contact with wires, etc. The plants in this series 

 of experiments all show a gain in height by contact with different 

 material. The effects of contact with wire netting (2-in. mesh) as 

 compared with no contact whatsoever in the normal plants is given 



Fig. 4. Showing growth of tomato plants in contact and not in contact with 



in Tables 2-4. In the former experiment (Table 2) 12 plants were 

 utilized, all of which were grown separately, 6 being surrounded by 

 cylinders of wire netting and 6 grown free from any contact whatso- 

 ever. The plants in contact with wire netting showed a gain in 

 height of 31 percent compared with those of the normals and the same 

 percentage gain is given in Table 3, in which case the contact plants 



