To the Editor: The paper, "Symptomatic Occult Hydrocephalus with 'Normal' Cerebrospinal-Fluid Pressure: A treatable syndrome," by Adams and his co-workers, which appeared in the July 15, 1965, issue of the Journal, has provoked a great deal of discussion in neurologic and neurosurgical circles. It has served to call our attention to a group of patients with progressive dementia associated with communicating internal hydrocephalus and insufficiency of the subarachnoid pathways about the cerebrum. These patients differ from those with the "degenerative" cerebral atrophies in that the former apparently have pressure atrophy of brain rather than primary atrophy of brain giving . . .