title: POSITIVE VARIATIONS IN NITELLA.
abstract: The reversible electrical variations hitherto described for plants and animals consist in a reversible loss of positive potential at a stimulated spot by which it becomes more negative. In this paper we describe changes which consist in a reversible loss of negative potential at a stimulated spot whereby it becomes more positive. We suggest that this be called a positive variation. The stimulation was produced in all cases by pinching or bending the cell. This produced a compression wave which traveled along the cell, producing a negative variation at a spot which was positive and a positive variation at a spot which was negative (due to application of 0.1 M KCl). The response produced by the compression wave differs in several respects from an ordinary propagated negative variation and may be termed a positive mechanical variation.
authors.affiliation: Laboratories of The Rockefeller Institute for Medical Research.
authors.forename: W J
authors.initials: WJ
authors.lastname: Osterhout
authors.forename: S E
authors.initials: SE
authors.lastname: Hill