In the article "Comparison of Stress Effects of Perceptual and Social Isolation," by Zuckerman et al in the April issue of the ARCHIVES, page 358, Table 2 should read as follows: The subheadings under the major heading "Interactions" are given as "Periods × Orders" and "Orders* Conditions." The subheading should read "Periods X Orders" and "Orders X Conditions." Under the major headings "Variables," the first line reads "Degrees of freedom physiological." The word "Variables" should be moved upward to be in line with the other major headings, "Main Effects" and "Interactions." The term "Degrees of freedom" should be on the same line with the numbers given below the column headings, thus: Degrees of freedom 1/12 24/288 1/12. . . . The word "Physiological" should then have been the major category of variables, thus:
No. NS GSRs
Heart rate. . . .