Bedford Street, Covent Garden, London, 

 January 1873. 



Macmillan & 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 

 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 Univer- 

 sities. With Diagrams. Crown 8vo. cloth. 51. 6d. 



It is hoped that the methods of solution here explained, and the in- 

 stances 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 Equa- 

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ON THE ALGEBRAICAL AND NUMERICAL THEORY OF 

 ERRORS OF OBSERYATIONS AND THE COMBINA- 

 TION OF OBSERVATIONS. Crown Svo. cloth. 6j. 6d. 



In order to spare astronomers and observers in natural philosophy the 

 confusion and loss of time which are produced by referring to : 'In- 

 ordinary treatises embracing both branches of probabilities {the first 

 E 1 a 



