PHOTIC ORIENTATION BY TWO POINT-SOURCES OF LIGHT.
General formulae are derived for the orientation of phototropic organisms in a field illuminated by two point-sources of light in the same horizontal plane. It is shown that formulae previously found may all be derived as special cases of these general equations.
Mitchell
W H
WH
Laboratory of General Physiology, Harvard University, Cambridge.
Crozier
W J
WJ