Abstract
The first eight lines appearing in column 1 page 289 of the March 1963 issue of THE JOURNAL OF HISTOCHEMISTRY AND CYTOCHEMISTRY (Vol. 11, No. 2) as part of the letter to the editor by Richard B. Cohen and Hubert J. Wolfe printed by error in the wrong position. These lines should have printed as the first eight lines of column 1 on page 288 as part of the letter to the editor by Geoffrey H. Bourne and M. Nelly Golarz.