Filtration of Plant Viruses

Abstract

THE preparation of graded collodion membranes has been greatly improved of recent years by W. J. Elford, who has developed a technique with which he can produce membranes of highly uniform structure and easily determinable average pore size. These he has used in an investigation of the probable sizes of bacteriophage and various animal viruses. We have examined a number of plant viruses with membranes prepared according to Elford's methods and with his generous help and advice and a short statement of some of our experiences and results may be of interest in themselves and of value to others.