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This state of the internal mind, which is requisite to constitute the just and temperate man, follows upon the habitual practice of just and temperate acts, and follows upon nothing else. But most men are content to talk without any such practice. Aristotle now sets himself to find a definition of virtue, per genus et differentiam.

Such definitions, however, are always liable to be overthrown by the discovery of new objects in nature. Definitions of this kind are what logicians have had in view, when they laid down the rule, that the definition of a species should be per genus et differentiam.

Multis videri poterit, majorem esso differentiam Simiae et Hominis, quam diei et noctis; verum tamen hi, comparatione instituta inter summos Europae Heroes et Hottentottos ad Caput bonae spei degentes, difficillime sibi persuadebunt, has eosdem habere natales; vel si virginem nobilem aulicam, maxime comtam et humanissimam, conferre vellent cum homine sylvestri et sibi relicto, vix augurari possent, hunc et illam ejusdem esse speciei.

This notion would account for the rule that all definition must necessarily be per genus et differentiam, and would also explain why any one differentia was deemed sufficient.

Differentia being seldom taken to mean the whole of the peculiarities constitutive of the species, but some one of those peculiarities only, a complete definition would be per genus et differentias, rather than differentiam.

Differentia being seldom taken to mean the whole of the peculiarities constitutive of the species, but some one of those peculiarities only, a complete definition would be per genus et differentias, rather than differentiam.

Si placet audire, dicam cur hic Imperator sit appellatus Grand Can. Audieram ego in partibus Ierosolymorum hunc esse sic dictum, a filio Noe, Cham: sed in terra Cathay accepi et aliam, et meram huius rei veritatem. Nam et scribendo haec duo nomina habent differentiam, quod filius Noe Cham scribitur quatuor elementis, quorum vltimum est M. et iste Can tribus tantum, quorum vltimum est N.

This was the object of logicians when they laid down that a species must be defined per genus et differentiam, meaning by the differentia one attribute included in the essence, i.e. in the connotation.

Amen, Amen, Fiat, fiatur, ad differentiam papae. Thus shall I have my touch-her-home still ready. My staff of love, sempiternally in a good case, will, satyr-like, be never toiled out a thing which all men wish for, and send up their prayers to that purpose, but such a thing as nevertheless is granted but to a few.

This notion would account for the rule that all definition must necessarily be per genus et differentiam, and would also explain why a single differentia was deemed sufficient.