ELECTROPHYSIOLOGICAL INVESTIGATION 



91 



Table 1. Threshold Concentrations of the Sexual Attracting Substances of 

 Bombyx mori and Porthetria dispar 



* Block (unpublished). 



^ Block, Boeckh and Schneider (unpublished). 

 *= Butenandt, Hecker, Hoppe and Koch, 1961. 

 ^ Hecker, 1960. 



* Jacobson, Beroza and Jones, 1960. 

 ^ Jacobson, Beroza and Jones, 1961. 

 « Schneider, 1962. 



