[Identification of "slow" cells in insects eyes]

Responses of "slow" cells of the compound eye of grasshopper to equal-energetic flashes of monochromatic light of different wavelengths were recorded by intracellular microelectrode. Majority of cells had the curve of spectral efficiency of 540 nm. This curve coincided practically with the curve of spectral efficiency measured with ERG. Colour adaptation significantly changed the curve of spectral efficiency of the "slow" cells. Intracellular staining of the "slow" cells of grasshopper, cricket and locusta by procion yellow M-4 or by sulphide of cobalt have shown that the "slow" cells are the cells of crystaline cone.