A Correction.
In a recent note, "A possible explanation of ;freezing' behavior in rats" (Bernard F. Riess. Science, 1945, 102, 570), the author was guilty of a serious omission which completely vitiated the meaning of the article. A comparison was made between two groups of animals, one living in multiple-animal cages, the other in isolation. In giving a description of the groups, the population of the multiple-housed animals was given as 124 and that of the second group was inadvertently omitted. There were 84 animals in this second group. This makes it possible to evaluate the difference between the two groups. The author apologizes for the omission.
Riess
B F
BF