Now for a fact out of the "Letter to a Brigadier." I could give you half a dozen of like character, but space is precious, and one, I think, will be sufficient. The writer quotes _in extenso_ a letter written by Townshend, published in _The Daily Advertiser_, and dated "South Audley Square, 20th June, 1760." Mr. Britton admits that the pamphlet must have been published "some time before the 5th October, as on that day a Refutation appeared;" it was, in fact, reviewed, or rather abused, in the _Critical Review_ for September. We have proof, therefore, that the "Letter to a Brigadier" was written after 20th June, and founded, in part, on facts known _in London_ only on the 21st of June at the earliest: the probabilities are that it was published in August or September, certainly before the 5th October. How then could it have been written by a man in America, serving before Montreal? L. B. G. MAPS OF AFRICA. (Vol. v., p. 261.) I do not know why, because a man publishes maps of Africa at Gotha, they should not be "fancy portraits," any more than why a man's book should be a good one, because it is printed on a composition which nobody but a German would have the effrontery to call paper. I had seen Spruner's Map a few weeks after it came out, and the conclusion I came to about it at the time was, that it was certainly a fancy portrait. I shall be glad to be shown that I am in error; and, as I am more sure of the fact that I did come to this conclusion after some examination, than I am of the argument whereby I arrived at it--for my memory is singularly gifted in this way--I should be obliged by E. C. H., or any of your correspondents, informing me what grounds there are for believing Spruner, or any one else, to have produced a map or maps of the north coast of Africa between long. 5° west, and 25° east of Greenwich, or any portion of the said coast,--said map or maps being the result of actual survey. Moreover, if I further inquire when any survey whatever took place of this coast at any time, and profess my utter ignorance of the history of our present _North_ African maps, and my great doubts of their credibility, let not your correspondents imagine that this is one of a _few_ things that I ought to be acquainted with, and really know nothing whatever about. AJAX. Replies to Minor Queries. _James Wilson, M.D._ (Vol. v., p. 276.).--To the numerous list of men whose services to literature our English biographers have injudiciously omitted to record may be added James Wilson, M.D. As editor of the _Mathematical tracts_ of Mr. Benjamin Robins in 1761, he has often been noticed with commendation. Beyond that circumstance, all is obscurity. He wrote, however, a valuable _Dissertation on the rise and progress of the modern art of navigation_, which was first published by Mr. John Robertson in his _Elements of navigation_ in 1764, and republished by him in 1772. The authors shall now speak for themselves:--