Summary

R. G. Latham A Handbook of the English Language

Now if the relation alone between two words constitute a case, the words a child, to a father, of a father, and father's, are all equally cases; of which one may be called the accusative, another the dative, a third the genitive, and so on.
Perhaps, however, the relationship alone does not constitute a case. Perhaps there is a necessity of either the addition of a preposition (as in of a father) , or of a change in form (as in father's) . In this case (although child be not so) father's, of a father, and to a father, are all equally cases.
Source: Gutenberg

R. G. Latham A Handbook of the English Language

A noun denotes an object of which either the senses or the intellect can take cognizance, and a verb does no more. To move = motion, to rise = rising, to err = error, to forgive = forgiveness. The only difference between the two parts of speech is this, that, whereas a noun [204] may express any object whatever, verbs can only express those objects which consist in an action. And it is this superadded idea of action that superadds to the verb the phenomena of tense, mood, person, and voice; in other words, the phenomena of conjugation.
Source: Gutenberg

R. G. Latham A Handbook of the English Language

Over what extent of language have we a plural? The Latins say bonus pater = a good father; boni patres = good fathers. In the Latin, the adjective bonus changes its form with the change of number of the substantive that it accompanies. In English it is only the substantive that is changed. Hence we see that in the Latin language the numbers were extended to adjectives, whereas in English they are confined to the substantives and pronouns. Compared with the Anglo-Saxon, the present English is in the same relation as it is with the Latin.
Source: Gutenberg

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