2d. _Directions for placing them._ Place the _Top_ of the +circular view+, _even_ with the _Top_ of the Page. The Plate will then lye over at the Bottom, and at the _right_ Side of the Page. Fold the Bottom up into the Book, even with the Margin: and the _right_ Side in like Manner. Observe to place the _Bottom_ of each of the other Plates, even with the _Bottom_ of the Page. The Plate will then lye _over_ at the Top, and at the _right_ Side of the Page. Fold the Top _down_, into the Book, _even_ with the Margin: and the right Side, in like Manner. The circular View, to _face_ Page 58. The Balloon over Helsbye-Hill, to _face_ Page 78. The Balloon Prospect, to _face_ Page 154. The explanatory Print, to be placed _on_ Page 155: and, when unfolded, to be seen _along with_ the Balloon-Prospect. Literal and other Errors proper to be examined, and corrected with the Pen, before the Book is read. Page. 6. Note [1]—ειαδεν _write_ ευαδεν. 18. Note [6]—_Cube_ of the Velocity, &c. _write_ (as in some Copies) Square of the Velocity, &c. the Resistence will be as 3 × 3 = 9.—See Chambers’s Dictionary, under +resistence+. 23. Section 21. _Blot out_ [Signs] of Currents. 26. _Before_ All Things being thus prepared, _insert_ [_Section_] _viz._ 25. 35. Line 13.—I o’Clock, _write_ I. o’Clock. 54. Section 52.—an Extent above them of 77 Miles, _write_ an Extent of 102 Miles. See the Occasion of this Mistake in Note (_a_) Calculation SECOND, which makes the Answer 102 Miles, 1 Quarter, 320 Yards; and the Ans. to the PROBLEM being 102 1 307 ————————————————————————— gives the Prospect 13 Yards less than _that_ over the Clouds. 84. Line 4.—great Turnpike-Road, _write_ great public Road. 84. Note [26] _After_ See Moore’s Practical Navigator, _insert_ See Page 98 [34]. 98. _After_ Note [34] _add_ See Section 84, Note [26]. 118. Line 5.—from a vertical Situation only, to be seen, _write_ to be seen from a vertical Situation only:. 174. Line 1.—excessine Diminution _write_ excessive Diminution. 177. Line 9.—contain _write_ contains. 202. The Sections 259, 260, 261, are repeated. 234. Line 6.—a Yard, _write_ two Yards. 236. Line 3. _After the Words_ in Danger of breaking; _add_ the Bottom of the Balloon must be opened, or the upper Valve drawn. _And erase the Remainder of the Sentence._ 237. Line 4.—which is a Sign that the Balloon descends, _write_ (which is a Sign that the Balloon descends). 242. Line 21.—supercede, _write_ supersede. 263. Line 5.—commonly: ascend, _write_ commonly ascend:. 266. Line 21.—their Passage _write_ its Passage. 271. Line 14.—each 4 Feet _write_ each 4 Inches.