These are the most important improvements in nautical knowledge and science, which renders navigation at present so much more safe and expeditious than it formerly was; there are, however, other circumstances which tend to the same object; the more full, accurate, and minute knowledge of the prevalent winds at different times of the year, and in various parts of the ocean; the means of foretelling changes of weather; and, principally, a knowledge of the direction and force of the currents must be regarded as of essential advantage to the seaman.  When to these we add, the coppering of ships, which was first practised about the year 1761, and other improvements in their built and rigging, we have enumerated the chief causes which enable a vessel to reach the East Indies in two-thirds of the time which was occupied in such a voyage half a century ago.

Nor must we forget that the health of the seamen has, during the same period, been rendered infinitely more secure; so that mortality and sickness, in the longest voyages, and under great and frequent changes of climate, and other circumstances usually affecting health, will not exceed what would have occurred on land during the same time.

The great advantages which the very improved state of all branches of physical science, and of natural history, bestow on travellers in modern times, are enjoyed, though not in an equal degree, by navigators and by those who journey on land.  To the latter they are indeed most important, and will principally account for the superiority of modern travels over those which were published a century ago, or even fifty years since.  It is plain that our knowledge of foreign countries relates either to animate or inanimate nature:  to the soil and geology, the face of the surface, and what lies below it; the rivers, lakes, mountains, climate, and the plants; or to the natural history, strictly so called:—­and to the manners, institutions, government, religion, and statistics of the inhabitants.  Consequently, as the appropriate branches of knowledge relating to these objects are extended, travellers must be better able, as well as more disposed, to investigate them; and the public at large require that some or all of them should at least be noticed in books of travels.  The same science, and many of the same instruments, which enable the seaman to ascertain his latitude and longitude, and to lay down full and accurate charts of the shores which he visits, are also useful to the land-traveller; they both draw assistance from the knowledge of meteorology which they may possess, to make observations on the climate, and from their acquaintance with botany and natural history, to give an account of the plants and animals.  But it is evident that so far as the latter are concerned, as well as so far as relates to the inhabitants, the land traveller has more opportunities than he who goes on a voyage.