“…(1920, If we follow the leading Marshall scholar, however, then this is not, in fact, a story of the dilution of superior races by inferior races. Instead, it is a neo-Lamarckian idea concerning the role of the environment in shaping people (Cook 2013). This would explain why, for example, Marshall made claims such as the following: 'vitality is lowered … by the rapid increase of town life ' (1920, 203).…”