Final answer:
Boston is 4 inches from West Quail on the map, given it is directly between Liberty and West Quail, and 4 inches from Liberty.
Step-by-step explanation:
If Boston is directly between Liberty and West Quail and is 4 inches from Liberty on a map, we can conclude that Boston is also the same distance from West Quail.
This is due to Boston being positioned in the middle of the two locations, implying equal distances from each. Therefore, on the map, Boston is 4 inches from West Quail as well.
To provide context, the given information about an 1807 map of Boston draws attention to the importance of relative locations and distances on maps, but does not contribute directly to solving this question, since the question itself seems to be a simplified measurement exercise rather than one requiring historical map analysis.