But if, after being thus justified and compelled to come forth in my defence, the matter should be found useful, either to myself or mankind, it would be foolish affectation to seem to feel shame and regret by too anxiously apologising and explaining the origin and consequent peculiar complexion of this publication, or of those which may follow in regular succession. And it is a truth, that it has increased my zeal and strengthened my resolve to prosecute that most useful of all studies, the study of mind,—its errors and diseases, with, I trust, so ardent a love of the truth, that I earnestly pray I may be enabled to trace every error to its source; for so much does the ground appear to me to be untrodden, that I pray also, that opportunity, life, health, and encouragement may be given me to complete the work I have to do, that, however slender my talents may be, I may yet feel that they have not been given me altogether in vain. In explaining in this Essay all the plans necessary to the moral and physical purposes of an efficient system of Classification, I have had slightly to introduce many cases and subjects to illustrate my present purpose; and feeling that I had not done them or myself justice, I have said, on these occasions, I shall hereafter treat this case or subject more amply in that part of the work in which they will be more directly and specifically introduced. Having thus incidently introduced many subjects without their being under any specific head or title, I shall, to enable the reader to form some conception of the matter, give in the contents something like a minute dissection of the whole. From all this, and also from what I say in my former work on Insanity, as well as in Allen _v._ Dutton, it will be seen that I have been induced to give pledge after pledge so repeatedly, that it becomes a serious matter, “partaking of the nature of a solemn obligation;” if, therefore, I fail to exert myself to redeem these pledges, I cannot have the excuse of those who promise without even intending to perform. In the preliminary remarks of Allen _v._ Dutton, I say at the conclusion, “I find I must do even more than this, (meaning the defence); for my defence would still be imperfect without a short statement of my views on the insane. For this purpose, I propose to write the following Essays: 1st.—On Classification, and Tables in Illustration. {vi} 2nd.—The different Divisions, into which I divide the Insane. 3rd.—Their General and Specific Character. 4th.—The Correspondence between Causes and Effects. 5th.—That the Study of Mind will evolve the Principle of Universal Generalization. 6th.—Their Moral and Medical Treatment. 7th.—A Selection of Cases in Illustration.