title: THE PHOTOTROPIC MECHANISM IN RANATRA.
abstract: Definite proof is obtained that in the phototropic orientation of Ranatra the relative postures of the appendages, resulting in a bilateral difference of effective stroke in swimming, is the mechanism of orientation; the frequency of locomotor movements is the same on the two sides of the body.
authors.affiliation: Zoological Laboratory, Rutgers University, New Brunswick, and the Carnegie Institution of Washington.
authors.forename: W J
authors.initials: WJ
authors.lastname: Crozier
authors.forename: H
authors.initials: H
authors.lastname: Federighi