Corrections

May, pages 69–71: In the letter from Jack Sarfatt, equation 1 should read: and the term on the right‐hand‐side of equation 2 should be $10−13 cm.$ Also the last three lines of page 69 should read: “…the smallest possible mass for a gravitational bound state of black holes at $t = 0…,$” and the fifth line from the end of this letter should refer to “hadron pairs, lepton pairs and photons….”