title: A GLASS ELECTRODE APPARATUS FOR MEASURING THE pH VALUES OF VERY SMALL VOLUMES OF SOLUTION.
abstract: A glass electrode apparatus is described with which pH measurements can be made with as small volumes as 2 drops (about 0.14 cc.) of solution. Using this apparatus the change of pH of the vacuolar sap of Nitella, due to the penetration of brilliant cresyl blue, has been readily followed. The sap and the dye have been found to poison the usual type of hydrogen electrode.
authors.affiliation: Laboratories of The Rockefeller Institute for Medical Research.
authors.forename: D A
authors.initials: DA
authors.lastname: Macinnes
authors.forename: M
authors.initials: M
authors.lastname: Dole