That the cerebral arteriopath is prone to transient spells of cerebral ischemia has been amply documented in the past ten years. Often presaging the development of a stroke, these brief episodes consist of the most varied combinations of paresis, numbness, dysphasia, vertigo, diplopia, dysarthria and so forth. So far they have not been satisfactorily explained although there is general agreement that a temporary failure of the local circulation is the immediate cause. The occurrence of unequal pulses at the wrist in some of these patients would ordinarily be regarded as simply the reflection of coincidental atherosclerotic disease in still another . . .