The whole work in fifty-one volumes was published at Madrid (1747-1886).
From a collection of the best experiments by previous workers he selected eighty-two (fifty-one on the velocity of water in conduit pipes, and thirty-one on its velocity in open canals); and, discussing these on physical and mechanical principles, he succeeded in drawing up general formulae, which afforded a simple expression for the velocity of running water.
A royal commission, appointed by the duc de Choiseul to examine the constitutions, convoked a private assembly of fifty-one archbishops and bishops under the presidency of Cardinal de Luynes, all of whom except six voted that the unlimited authority of the general was incompatible with the laws of France, and that the appointment of a resident vicar, subject to those laws, was the only solution of the question fair on all sides.
At that time Catherine was essentially what she was to remain till her death fifty-one years later.
Thus in fifty-one years the imperial and Christian territory in Sicily was cut down to a few points on or near the eastern coast, to the Val Demone in short without Messana.