A treatise on spherical trigonometry, and its application to geodesy and astronomy, with numerous examples. By John Casey.

Recently Published, Crown 8vo, 276 pp., Cloth, 7/6.
A TREATISE
ON
PLANE TRIGONOMETRY,
CONTAINING
AN ACCOUNT 0F HYPERBOLIC FUNCTIONS,
WITH
BY
JOHN CASEY, LL.D., F.R.S.,
Fellow of the Royal University of Ireland; Member of the Council
of the Royal Irish Academy, &c., &c.
Dublin: Hodges, Figgis, & Co. London: Longmans, Green, & Co.
EXTRACTS FROM CRITICAL NOTICES.
From the " LYCEUM," May, 1888.. "There is a great deal of new matter not hitherto introduced into text-books on trigonometry, at least in these countries
-matter which is not only interesting in itself, but important on
account of the present requirements of the higher mathematical
teaching.... The author has given many proofs of well-known
theorems, as in the case of the four fundamental formulae. Some
of these are original, others are contributed by distinguished
correspondents, and last, though not least, many have been
derived by very extensive reading from the writings of wellknown authors, to whom reference is always carefully made.
Indeed this last fact adds a great interest from an historical point
of view to all Dr. Casey's works. It is a decided mistake, as
well as an injustice, to ignore the merits of other writers, and to
appropriate their work without due acknowledgment, as is too
often done. Many theorems owe much of their interest to the
fact that they are associated with the names of Euler, Jacobi,
Lagrange, Cauchy, or even stars of a much lesser magnitude...."
I