Places   (Help with places, streets and buildings in Wigan.)

Here are 2 links.

The first is to old-maps.co.uk.  Once on the site If you click on the Enlarge View button on the top map which is the 1864-68 Wigan Town Plan, you can then use the scroller on your mouse to get free access up to a certain "zoom" level of the historic mapping.  If you  scroll across the street "Scholes" to the right hand side of the map you can clearly make out Mitchinson's Square and this is roughly in the same position as the present day Morris Street.  Adjacent is Boy's Well Lane, site of the present day Boyswell House.
 
If you then click on the Enlarge View button next to the 1890 map, you can now see the same location now called Mitchinson's Yard.

The second link is to a fascinating report of 1849, on sewerage, drainage and sanitation in Wigan.  Mitchinson's Yard is mentioned on page 14, paragraph 41.  

OS Town Plan - Wigan  

See reference to Mitchinson's Yard paragraph 41