“…The choice of the rat was most fortunate because, like man, it develops permanent hypertension after constriction of only one renal artery, and so we were able to study the effect of hypertension on an untouched kidney in the absence of renal failure. In these 'two-kidney' experiments we observed acute vascular crises, some of which presented with convulsions and coma as in human hypertensive encephalopathy, others with weakness, cyanosis and rapid loss of weight (Wilson & Byrom, 1939, 1941, and after death we were able to demonstrate in the untouched kidney the full picture of malignant nephrosclerosis, matching lesion for lesion, and so to complete the experimental proof of Volhard's clinico-pathological concept of primary malignant hypertension.…”