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ficient. Examples are given for finding the latitude by the altitude of the pole-star in the College Examination-Papers at the end of the volume.

Another important and very necessary addition will be found in the page of errata. To obtain this, the examples have been recalculated, and the author trusts the principal errata have been discovered: still, in a work like the present, in which so many thousand figures must be used to obtain the answers, it is difficult to avoid mistakes; and it is only after several revisions that a near approach to correctness can be made.

ROYAL NAVAL COLLEGE,
October 21, 1857.

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6120

to

6080

Salter at to of: it should read bearing of, instead

of bearing at.

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S after correction, add +2′ 42′′ and height of eye

above the sea.

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the correction 4′ 38′′ should be added: the cor

rect latitude will then be 54° 53′ 21′′ N.

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224 Make the following addition to the example worked out :

App. Dist.

to

123

56

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23° 3' 4"

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72° 42′ 16′′

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237 In the example worked out the horizontal parallax should be

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205 The analytical expression in this page is incorrectly printed:

it will be found correct in its proper place in Part II.

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