The deficits of the book are essentially the same as those of almost all biological research in psychiatry and, I suspect, endocrinology—the fact that it is a collection of many small studies leading to interesting but tentative findings. Almost all research, unfortunately, fails to yield findings that permit clear diagnostic conclusions or clear laboratory markers that are usable in clinical therapy. Even the dexamethasone suppression test (DST) , the most widely used and studied assay, probably yields abnormal results among many patients with depression, especially those with psychotic depression, but has yet to show the specificity and sensitivity necessary to determine diagnosis and predict response to treatment.