Next as to plan. I have always told you that the plan you mention, so far as your own narrative goes, is the _very best_ which could possibly be chosen. _You_ have to speak of the birds as they are alive, _I_ to speak of their outward form, structure, and their place in the great System of their Creator, for the true system, if I have, or anybody else, has discovered is not a _Human_ System. If my views are correct, every observation you make, _plain_, _unvarnished_, and strictly _accurate_, will fully and perfectly harmonize. Our parts are totally distinct, and we have no occasion to consult with each other what we should say at every page. Where our views may differ, I shall not, of course, say anything. My own remarks had better be kept distinct, in the form of "Scientific Notes" to each letter, at the end, and in this way you will make the work, the _standard authority_ on American Ornithology, which without Science, it certainly would not be, however interesting or valuable in other respects. As to time, and remuneration, I shall have completed all my portion of Dr. Richardson's works in two months. I can then _devote_ a portion of each day to yours. The terms of my remuneration will be those which I always receive from the Booksellers, and which are fixed, worth twelve guineas a sheet of the same size and Type as the Zoölogical Journal, each sheet being 16 pages, and each page averages 390 words, the calculation is there brought to a nicety, and you may spend as much as you choose. If I have to revise and correct the proofs, make alterations etc. that will be something additional, I always charge this by the _time_ each sheet takes me, and would come to from 5/ to 7/6 a sheet but the booksellers generally give me a round sum, which I name after trying the three first sheets of a work, with Dr. Richardson's the case was different, I there had 300 £ for my assistance and drawings. It would of course be understood that my name stands in the title page as responsible for such portion as concerns me.