Mechanism of the Post Office, Francis B. Head, The Quarterly Review, Jun. 1850, vol. 87, pp. 69-115.
http://books.google.com/books?id=4m8JAAAAQAAJ

[excerpt, p. 115]


See also, The London Quarterly Review, American edition, Jul. 1850, vol. 87, pp. 37-62.
http://books.google.com/books?id=hZApAAAAYAAJ