The upper diagram (240 mm x 265 mm) shows the canal proposed by one 'Mr. Blackmore'; it reflects a revised version of his original proposals, involving some complicated additional engineering projects to bring water to the King's palace at Hampton Court, the 'New Cut', while expanding the Colne River, Heatham Stream and Stanwell Stream so as not to harm the water-flow to the mills downstream of the canal nor, indeed, the Thames itself, which early objectors to the scheme had all complained about.

The letterpress text explains the benefits of this scheme, lists the objections raised and, in a partisan fashion, rebuts the objections.

The second map (190 mm x 265 mm), copied from Thomas Acherley's (the previous item), is accompanied by the extract of the document that criticizes (again in a highly partisan fashion) his proposals, concluding that his scheme was unworkable.

In fact, it was the Blackmore scheme that was judged unviable, in that there was insufficient "drop" to create a flow from the Colne to the reservoir in London, while Acherley's scheme, though possible, never garnered the support necessary to proceed.