If you count the strokes of either of your horse's fore feet, either walking or trotting, you will find them to be upon an average, about 950 to a mile. In a field-book, as you note each change of bearing, you have only to note down also the number of paces (which soon becomes a habit); and to keep count of these, it is only necessary to carry about thirty-five or forty small pieces of wood, like dice (beans or peas would do), in one waistcoat pocket, and, at the end of every 100 paces, remove one to the empty pocket on the opposite side. At each change of bearing, you count these, adding the odd numbers to the number of hundreds, ascertained by the dice, to be counted and returned at each change of bearing to the other pocket. You should have a higher pocket for your watch, and keep the two lower waisctoat pockets for this important purpose. "Now, to plot such a survey, you have only to take the half-inch scale of equal parts (on the 6-inch scale in every case of instruments), and allowing TEN for a hundred, the half-inch will represent 1000 paces. You may thus lay down any broken number of paces to a true scale, and so obtain a tolerably accurate map of each day's journey. The latitude will, after all, determine finally the scale of paces; and you can, at leisure, adjust each day's journey by its general bearing between different latitudes; and, subsequently, introduce the details. You will soon find the results sufficiently accurate to afford some criterion of even the variation of the needle, when the course happens to be nearly east or west, and when, of course, it behoves you to be very well acquainted with the rate of your horse's paces, as determined by differences of latitude. You will be careful to intersect the prominent points of any range that may appear on the horizon; and the nature of the rock also should be ascertained in the country examined: small specimens, with letters of reference, will be sufficient for this. Specimens of the grasses, and of the flower or seed of new trees, should be also preserved, with dates, in a small herbarium. But the principal object of the journey being the determination of the course of the Victoria, and the discovery of a convenient route to the head of the Gulph of Carpentaria, the accomplishment of these great objects must be steadily kept in view, without regard to minor considerations. Should the channel finally spread into an extensive bed, whether dry or swampy, you will adhere, as a general rule, to the eastern side or shore, as, in the event of any scarcity of water, the high land known to be there will thus be more speedily accessible to you; and I am also strongly of opinion, that you would cross in such a route more tributaries from the east than from the west. On arriving at or near the Gulph of Carpentaria, I have particularly to caution you against remaining longer than may be unavoidable there, or, indeed, in any one place, in any part of your