Bedford Street, Covent Garden, London, 

 January 1873. 



Macmillan 6- Co:s Catalogue of Works 

 in Mathematics and Physical Science; 

 ncluding Pure and Applied Mathe- 

 matics; Physics, Astronomy, Geology, 

 Chemistry, Zoology, Botany; Physiology 

 Anatomy and Medical Works generally ; 

 and of Works in Mental and Moral 

 Philosophy and Allied Subjects. 



MATHEMATICS. 



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



ELEMENTARY TREATISE ON PARTIAL DIFFERENCIAL 

 EQUATIONS. Designed for the Use of Students in the Univer- 

 sities. With Diagrams. Crown 8vo. cloth. 5^. bd. 



It is hoped that the methods of solution here exjtlained, and the hi- 

 stances exhibited, will be found sufficient for af plication to nearly 

 all the important problems of Physical Science, whi^h require for 

 their complete investigation the aid of Partial Differential Equa- 

 tions. 



ON THE ALGEBRAICAL AND NUMERICAL THEORY OF 

 ERRORS OF OBSERA'ATIONS AND THE COMBINA- 

 TION OF OBSERVATIONS. Crown 8vo. cloth, bs. bd. 



In order to spare astronomers and observers in natural philosophy the 

 confusion and toss of time which are produced by .referring to the 

 ordinary treatises embracing both branches of probabilities {the first 



