Photograph of the Mercat Cross in Castle Street, Aberdeen, with Union Street in the background. In the left of the foreground, a man stands in shade. On the right of the foreground, illuminated by a shaft of sunlight cast from between buildings, two boys and a man stand alongside a hand cart.

A Mercat Cross is the Scottish term for a market cross which are frequently found in many Scottish towns and cities. With the strong contrasts between light and shade, this photograph may be a an example of Wilson's technical competence as a photographer in his ability to balance the exposure between the two areas. This photograph is a later carbon copy of the original albumen photograph. Carbon was a process that was less susceptible to fading, unlike an albumen print that is prone to discolouration over time.