In “Kinetic Assessment of Alternative Complement Pathway Activity in a Hemolytic System. I. Experimental and Mathematical Analyses” by Rutherford B. Polhill, Jr., Kenneth M. Pruitt, and Richard B. Johnston, Jr., in the July issue of the Journal of Immunology, Volume 121, Number 1, page 364, the horizontal axis in Figure 1 should be labeled “2, 4, 6, 8, …” instead of “1, 2, 3, 4, …”

On page 366, equation 1 should read:

On page 368, the cell concentrations given in the second paragraph of the first column should be multiplied by 2. The result of this change is to double the maximum lytic velocity for the alternative pathway. Thus, the 12th line of paragraph 2 should be changed to read “25-fold” instead of “50-fold.” The same change should be made in the 5th line from the bottom of the Abstract on page 363.

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