278. Lines 15 and 18.—third Tables _and_ third Table, _write_ fourth Tables _and_ fourth Table. 283. Note [119].—more than the three first Decimals _write_ more than the four first Decimals. 288. Line 5. _After_ .0000076, _insert_ which, being divided by .1, gives a Cypher less. 288. Line 11.—with 4° on .25, _write_ with 4° on 25. 290. Note [120]—at low Water.) _write_ at low Water. 292. Line 23.—there will remain the greater Height, _write_ there will remain, +secondly+; (see Section 367) the greater Height. 303. Line 6.—(viz. the 8,) _write_ (viz. the .8,). 309. Line 10. Marginal Note.—_7th Step in Section_ 366. write _7th Step in Section_ 368. 310. _After_ Line 23, _insert_ _Air_-Thermom. 56°. 311. Line 1.—By the Practice of the first Example, _write_ Practice of the second Example. 312. Line 29. _After_ The Answer, &c. _insert_, made by rejecting a Cypher,. 317. Before the last Line but two, _insert_ +end of the first stage+. 318. Line 23.—the 2d Tenth, _write_ the 1st Tenth. 319. Line 13.—, gives 7. _write_, gives 97. 322. last Line but two.—and the remaining Feet _write_ the remaining Feet. AIROPAIDIA: CHAPTER I. [Sidenote: Introduction.] Section 1. The Public have, for a considerable Time, been entertained with Accounts of aërial Voyages. Such Accounts are, in many Respects, vague and unsatisfactory: by no Means adequate to the Expectations and Wishes, which have been formed by those, who have not yet penetrated the profound Heights of the Atmosphere. [Sidenote: Mistakes to be noticed, as Examples of Avoidance.] 2. The Voyagers have, now and then, been pretty accurate in Regard to Time Place Distance and Velocity: Circumstances highly worthy of Remark, in order to estimate the Improvement already made in this wonderful Discovery, and point out its Use: but neither ought the _several Occasions of Failure_ in the Experiments to be omitted; as they will be found to arise more from a Want of Prudence and Foresight in the Managers, than from any Defect in the Machine, or the Principle on which it acts. Such Failure ought therefore to throw an additional Light and Credit on the Art: and give a Spur to Ingenuity, which, it is not to be doubted, will continue to drive forwards with the same rapid Success; nor rest, till the Art itself is brought to the highest Degree of Perfection; till airostatic Ships make the Circuit of the Globe: a +Navigation+ which, from its Novelty and Importance, deserves to be considered in a separate Treatise. [Sidenote: Aërial Voyagers defective in their Descriptions.]