«LOGIC, n. The art of thinking and reasoning in strict accordance with the limitations and incapacities of the human misunderstanding. The basic of logic is the syllogism, consisting of a major and a minor premise and a conclusion --thus:_Major Premise_: Sixty men can do a piece of work sixty times as quickly as one man._Minor Premise_: One man can dig a posthole in sixty seconds; therefore --_Conclusion_: Sixty men can dig a posthole in one second. This may be called the syllogism arithmetical, in which, by combining logic and mathematics, we obtain a double certainty and are twice blessed.»