To the Editor.— David (226:468, 1973) noted a discrepancy between my communication toThe Journal(225:992, 1973) and to the New England Journal of Medicine (289:380, 1973) concerning the effect of suicide prevention centers on the suicide rate of cities in the United States. The communication toThe Journalcompared data from 1960 with data from 1968. The communication to the New England Journal of Medicine compared data from 1960 with data supplied to me from the National Institutes of Health for 1969. Simultaneous appearance of the communications was due to differing publication lags. The communications were submitted six weeks apart. That the two sets of data support different conclusions is not surprising. The data from 1969 were more supportive of a conclusion that suicide prevention centers do have an effect on the suicide rate than the data from 1968, although neither set of data should arouse more hope. Although