1817- 1820	New Plan of Ship Building by Capt. Hayes	419

of the same class, one of which was designed by Sir Robert Seppings, and the other built by the students of Portsmouth dockyard, under the superintendence of Professor Inman." *

In the former edition of this work, we were induced to give a brief account of the first two expeditions to the polar regions, in search of a north-west passage. Other expeditions to the same spot have since been undertaken; and if we broached the subject at all, we could not expect to make it interesting, or even intelligible, unless we brought down occurrences to a date far beyond the period to which this work, by its title is restricted. Several works have been published exclusively on the subject of these expeditions, and they are in most people's hands: consequently there is the less occasion for us to deviate from our plan, and enlarge a volume already of a much greater bulk than any of its companions.

* Marshall, vol. ii., p. 683.

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