the author had declared it to have been a general rule with him ‘to place words and phrases which appertain more especially to one head, also under other heads to which they have a relation,’ whenever it appeared to him ‘that this repetition would suit the convenience of the inquirer and spare him the trouble of turning to other parts of the work.’[1] But, with the now increased mass of words, it became a question, in many cases, whether such repetition would still prove convenient. Where categories might by that course be unduly swollen, or where they might, by reason of their being separated from each other by subtile distinctions or faint lines of demarcation, be thereby too nearly assimilated, I thought it would often be better to confine words of the kind referred to to their primary headings. The necessity of keeping the book within reasonable dimensions had also to be borne in mind.
Under these circumstances, the best method of ensuring the ready accessibility of the multitude of words now to be dealt with, and at the same time preserving unimpaired the unity of the several categories, appeared to me to lie in the copious use of references from one place in the book to another. Relying on this contrivance as a means of opening more widely the resources of the collection, by making the groups of words mutually suggestive, and thereby leading, not only to more varied forms of expression, but to kindred ideas, I have added largely to the references already inserted by the author. I have also ventured occasionally to substitute a reference for a group of words,[2] when the identical group existed in another place, and could thus be made immediately available.
In order, at the same time, to make the value of the references more appreciable, I have (whenever it has appeared to me to be necessary) inserted, in a parenthesis, a word indicating the nature of the group or category referred to. Any one using the book will thereby be enabled to judge whether it will be worth his while to turn to the place in question. He will, in some cases, perceive at once that it is useless to look there for the expression he seeks. In other cases, an appropriate word may occur to his mind on the mere suggestion of the class to which it belongs. In none of these cases will further search be necessary.
The cross references may also be looked upon as indicating in some degree the natural points of connection between the categories, and the ramification of the ideas which they embody. As would be the case under any classification of language, a large proportion of
