for which no definite rule can be given; it is not a mere aptitude for what can be learnt by a rule. Hence originality must be its first property.

(2) But since it also can produce original nonsense, its products must be models, i.e. exemplary; and they consequently ought not to spring from imitation, but must serve as a standard or rule of judgement for others.

(3) It cannot describe or indicate scientifically how it brings about its products, but it gives the rule just as nature does. Hence the author of a product for which he is indebted to his genius does not himself know how he has come by his Ideas; and he has not the power to devise the like at pleasure or in accordance with a plan, and to communicate it to others in precepts that will enable them to produce similar products.