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Up to the time of his admission to the College, Jerome had never felt that he could depend entirely upon medicine for his livelihood. He now determined to publish his Practica Arithmeticæ, the book which he had prepared pari passu with the ill-starred De Malo Medendi.

The eminent Italian engineer Lombardini published in 1870, under the title of Guida allo studio dell' idrologia fluviale e dell' Idraulica practica, which serves both as a summary of the recent progress of that science and as an index to the literature of the subject. But in any event, these theoretical objections are counsels apres coup.

The De Subtilitate and the De Varietate Rerum; the Liber Artis Magnæ, the Practica Arithmeticæ, have been noticed as the most enduring portions of his legacy to posterity; wherefore, before saying the final word as to his literary achievement, it may not be superfluous to give a brief glance at those of his books which, although of minor importance to those already cited, engaged considerable attention in the lifetime of the writer.

'Practica quidem scientia est, quae recte vivendi modum ac disciplinae formam secundum virtutum institutionem disponit. To say that the mediæval method of approaching economic problems was fundamentally different from the modern, is not in any sense to be taken as indicating disapproval of the former.

Kingsford furnishes the following list: 1. "Commentarii in Versus Aegidii de Urinis," quoted by John Gaddesden and probably authentic. "Practica Medicinae," mentioned by Pits, but of doubtful authenticity. "Experimenta Magistri Gilliberti, Cancellarii Montepessulani," noticed on page 2, but authenticity doubtful. "Compendium super Librum Aphorismorum Hippocratis." MS. in Bodleian.

The period of Gaffori's greatest achievements in theoretical work, especially his noted "Practica Musicae," from which Hawkins quotes copiously, was later than his residence at Mantua, but his studies at that court at least betoken the existence of a congenial atmosphere, and we may be assured that such an enlightened amateur as Ludovico did not neglect opportunities to acquaint himself with the workings of this studious mind.

Some of these cures he directly attributed to Constantine. Then there is a Bartholomew who wrote a "Practica," or "Manual of the Practice of Medicine," with the sub-title, "Introductions to and Experiments in the Medical Practice of Hippocrates, Constantine, and the Greek Physicians." Bartholomew represents himself as a disciple of Constantine.

They attracted wide attention in his own and immediately succeeding generations. The proof of this is that they exist in a large number of manuscript copies. Just as soon as printing was introduced his books appeared in edition after edition. His "Practica" was printed in no less than seven editions in Venice.

The Middle High Dutch manuscripts of this "Practica" of Bartholomew come mainly from the thirteenth century, and have not only a special interest because of their value in the history of philology, but because they are the main sources of all the later books on drugs which appeared in very large numbers in German. They have a very great historico-literary interest, especially for pharmacology.

M. Le Roy and the other Christian pragmatists have returned to the Nominalism of Duns Scotus. The following words of Frassen, one of Scotus' disciples, might serve as a motto for the whole school: 'Theologia nostra non est scientia. Nullatenus speculativa est, sed simpliciter practica. Theologiae obiectum non est speculabile, sed operabile. Quidquid in Deo est practicum est respectu nostri.