William Blades,
The Enemies of Books
“ Indeed, so conservative is a good binding, that many a worthless book has had an honoured old age, simply out of respect to its outward aspect; and many a real treasure has come to a degraded end and premature death through the unsightliness of its outward case and the irreparable damage done to it in binding. The weapon with which the binder deals the most deadly blows to books is the "plough," the effect of which is to cut away the margins, placing the print in a false position relatively to the back and head, and often denuding the work of portions of the very text. ”

