A necessity is upon me now--as at most times--of wandering about in my old wild way, to think. I could no more resist this on Sunday or yesterday than a man can dispense with food, or a horse can help himself from being driven. I hold my inventive capacity on the stern condition that it must master my whole life, often have complete possession of me, make its own demands upon me, and sometimes, for months together, put everything else away from me. If I had not known long ago that my place could never be held, unless I were at any moment ready to devote myself to it entirely, I should have dropped out of it very soon. All this I can hardly expect you to understand--or the restlessness and waywardness of an author's mind. You have never seen it before you, or lived with it, or had occasion to think or care about it, and you cannot have the necessary consideration for it. "It is only half-an-hour,"--"It is only an afternoon,"--"It is only an evening," people say to me over and over again; but they don't know that it is impossible to command one's self sometimes to any stipulated and set disposal of five minutes,--or that the mere consciousness of an engagement will sometimes worry a whole day. These are the penalties paid for writing books. Whoever is devoted to an art must be content to deliver himself wholly up to it, and to find his recompense in it. I am grieved if you suspect me of not wanting to see you, but I can't help it; I must go my way whether or no. I thought you would understand that in sending the card for the box I sent an assurance that there was nothing amiss. I am pleased to find that you were all so interested with the play. My ladies say that the first part is too painful and wants relief. I have been going to see it a dozen times, but have never seen it yet, and never may. Madame Celeste is injured thereby (you see how unreasonable people are!) and says in the green-room, "M. Dickens est artiste! Mais il n'a jamais vu 'Janet Pride!'" It is like a breath of fresh spring air to know that that unfortunate baby of yours is out of her one close room, and has about half-a-pint of very doubtful air per day. I could only have become her Godfather on the condition that she had five hundred gallons of open air at any rate every day of her life; and you would soon see a rose or two in the face of my other little friend, Ella, if you opened all your doors and windows throughout the whole of all fine weather, from morning to night.