We must inform Mr Sadler, in the first place, that we inserted the vowel which amuses him so much, not from ignorance or from carelessness, but advisedly, and in conformity with the practice of several respectable writers. He will find the word hecatare in Ree's Cyclopaedia. He will find it also in Dr Young. We prefer the form which we have employed, because it is etymologically correct. Mr Sadler seems not to know that a hecatare is so-called, because it contains a hundred ares. We were perfectly acquainted with the extent as well as with the name of a hecatare. Is it at all strange that we should use the words "250, or rather more," in speaking of 258 and a fraction? Do not people constantly employ round numbers with still greater looseness, in translating foreign distances and foreign money? If indeed, as Mr Sadler says, the difference which he chooses to call an error involved the entire argument, or any part of the argument, we should have been guilty of gross unfairness. But it is not so. The difference between 258 and 250, as even Mr Sadler would see if he were not blind with fury, was a difference to his advantage. Our point was this. The fecundity of a dense population in certain departments of France is greater than that of a thinly scattered population in certain counties of England. The more dense, therefore, the population in those departments of France, the stronger was our case. By putting 250, instead of 258, we understated our case. Mr Sadler's correction of our orthography leads us to suspect that he knows very little of Greek; and his correction of our calculation quite satisfies us that he knows very little of logic.