What is "Hume's Fork"

Question: What is "Hume's Fork"
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Hume divided knowledge into 2 categories--the tautological type, such as "All bachelors are men!." This is analytical, which he said does nothing to describe the world, because other words could be used, such as "All montesaurses are bipedal!." But it does not prove nor even imply that "montesaurses" exist!.

The fork is like a fork in the road!. The other category is "matters of fact," such as "I burned my hand!." This is different because it is not self explanatory and "the world" must be looked at to know if the statement is factual--"Is your hand burned!?"Www@QuestionHome@Com

I believe that Hume uses the terms "relations of ideas" and judgments of fact!. These categories would later be known respectively as analytic and synthetic judgments!. An example of a relation of ideas could be "All bachelors are unmarried men!." Synthetic judgments include statements such as "Water is H2o!."Www@QuestionHome@Com