His studies of the nutritional status of school children in Cambridge showed that supplementation of the diet with vitamins had little effect on their general health.[13] The studies also showed serendipitously that children from a poorer area of Cambridge were shorter and lighter, and had lower haemoglobin levels and a weaker grip, than those from a wealthier area. Moreover, children from three industrial towns in Scotland were, on average, inferior in the same four measurements to the average Cambridge child, and the children from the poorer families in the Scottish towns were inferior in these measurements to those from the wealthier families.[14]