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They drank a mug of beer in the ferry-house, and used to converse with the student, for he was a clever young man, who knew his "Practica," as they called it; he could read Greek and Latin, and was well up in learned subjects. "The less one knows, the less it presses upon one," said Mother Soren.

This "Practica" of Bartholomew was one of the most commonly used books of the twelfth and thirteenth centuries throughout Europe. There are manuscript commentaries and translations, and abstracts from it not only in the Latin tongues, but especially in the Teutonic languages.

He was born in Damascus, and flourished about the middle of the ninth century. He wrote a book on medicine called the "Aggregator," or "Breviarium," or "Practica Medicinæ," which appeared in many printed editions within the century after the invention of printing. During the ninth century, also, we have an account of Honein Ben Ischak, who is known in the West as Johannitius.

In the same year lived Peter of Lombardy, who wrote what he called a "Complete Treatise upon the Hermetic Science," an abridgement of which was afterwards published by Lacini, a monk of Calabria. In 1330 the most famous alchymist of Paris was one Odomare, whose work "De Practica Magistri" was, for a long time, a hand-book among the brethren of the science.

John of Vigo, in his book, the Practica Copiosa, published in 1514, and repeated in many editions, became the standard authority on all these subjects, and thus supplanted the works of the ancient writers.

First, Physica. FIRST, The knowledge of things, as they are in their own proper beings, then constitution, properties, and operations; whereby I mean not only matter and body, but spirits also, which have their proper natures, constitutions, and operations, as well as bodies. Secondly, Practica.