title: THE MEASUREMENT OF GALVANOTROPIC EXCITATION.
abstract: The expression of galvanotropic excitation in energy units is obtained by the measurement of the current densities required to balance phototropic excitation (or reciprocally). With the triclad Leptoplana preliminary measurements show that the current is proportional to the logarithm of the light intensity.
authors.affiliation: Laboratory of General Physiology, Harvard University, Cambridge, and the Mount Desert Island Biological Station, Salisbury Cove.
authors.forename: W J
authors.initials: WJ
authors.lastname: Crozier
authors.forename: T J
authors.initials: TJ
authors.lastname: Stier