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Bedford Street, Covent Garden, London,
January 1873.

Macmillan & Co.'s Catalogue of Works in Mathematics and Physical Science; including Pure and Applied Mathematics; Physics, Astronomy, Geology, Chemistry, Zoology, Botany; Physiology Anatomy and Medical Works generally; and of Works in Mental and Moral Phllosophy and Allied Subjects.

MATHEMATICS.

Airy.— Works by Sir G. B. Airy, K.C.B., Astronomer Royal:—

ELEMENTARY TREATISE ON PARTIAL DIFFERENTIAL EQUATIONS. Designed for the Use of Students in the Universities. With Diagrams. Crown 8vo. cloth. 5s. 6d.

It is hoped that the methods of solution here explained, and the instances exhibited, will be found sufficient for application to nearly all the important problems of Physical Science, which require for their complete investigation the aid of Partial Differential Equations.

ON THE ALGEBRAICAL AND NUMERICAL THEORY OF ERRORS OF OBSERVATIONS AND THE COMBINATION OF OBSERVATIONS. Crown 8vo. cloth. 6s. 6d.

In order to spare astronomers and observers in natural philosophy the confusion and loss of time which are produced by referring to the ordinary treatises embracing both branches of probabilities {the first
E i/1750.I.73
A