Gerwing, Julia (The University of British Columbia, Vancouver, British Columbia, Canada), Claude E. Dolman, M. E. Reichmann, and Hardial S. Bains. Purification and molecular weight determination of Clostridium botulinum type E toxin. J. Bacteriol. 88:216-219. 1964.-A method was developed whereby type E botulinus toxin can be obtained in a highly purified state by elution through acidified diethylaminoethyl-cellulose columns. The material thus isolated appears to be electrophoretically and ultracentrifugally homogeneous. A molecular weight of 18,600 was calculated for the toxin.