What I have said concerning the preposition _of_, may in some measure be applied to the prepositions, _to_, _for_, _with_, _by_, and to whatever other prepositions are made use of in modern languages, to supply the place of the ancient cases. They all of them express very abstract and metaphysical relations, which any man, who takes the trouble to try it, will find it extremely difficult to express by nouns substantive, in the same manner as we may express the relation denoted by the preposition _above_, by the noun substantive _superiority_. They all of them, however, express some specific relation, and are, consequently, none of them so abstract as the preposition _of_, which may be regarded as by far the most metaphysical of all prepositions. The prepositions therefore, which are capable of supplying the place of the ancient cases, being more abstract than the other prepositions, would naturally be of more difficult invention. The relations at the same time which those prepositions express, are, of all others, those which we have most frequent occasion to mention. The prepositions _above_, _below_, _near_, _within_, _without_, _against_, &c. are much more rarely made use of, in modern languages, than the prepositions _of_, _to_, _for_, _with_, _from_, _by_. A preposition of the former kind will not occur twice in a page; we can scarce compose a single sentence without the assistance of one or two of the latter. If these latter prepositions, therefore, which supply the place of the cases, would be of such difficult invention on account of their abstractedness, some expedient, to supply their place, must have been of indispensable necessity, on account of the frequent occasion which men have to take notice of the relations which they denote. But there is no expedient so obvious, as that of varying the termination of one of the principal words. It is, perhaps, unnecessary to observe, that there are some of the cases in the ancient languages, which, for particular reasons, cannot be represented by any prepositions. These are the nominative, accusative, and vocative cases. In those modern languages, which do not admit of any such variety in the terminations of their nouns substantive, the correspondent relations are expressed by the place of the words, and by the order and construction of the sentence.