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the four categories let substance be taken first, which having been taken let it be examined and further divided into (1) tobacco, and (2) pipes. To which division it may be objected, "Præterire aliquid maximum vitium in dividendo est"—"In division to pass over anything is a very great fault"; since many things have been omitted (jars, pouches, and the like). The reason for which omission is that all those things which have been omitted are trifling and unimportant, being contingently unnecessary, and not worthy of any systematic consideration. Wherefore I am constrained to censure all those (notably Gulielmus Cassiteridensis) who have ventured to differ from me in this