16 EDUCATIONAL BOOKS. 



and Professor of Mathematics in Queen's College, Belfast. 8vo. 

 gs. 6d. 



' ' This treatise supplies a great educational need. " EDUCATIONAL 

 TIMES. 



Wolstenholme. A BOOK OF MATHEMATICAL 



PROBLEMS, on Subjects included in the Cambridge Course. 

 By JOSEPH WOLSTENHOLME, Fellow of Christ's College, some- 

 time Fellow of St. John's College, and lately Lecturer in Mathe- 

 matics at Christ's College. Crown 8vo. cloth. Ss. 6d. 

 "Judicious, symmetrical, and well arranged" GUARDIAN. 



SCIENCE. 



ELEMENTARY CLASS-BOOKS. 



IT is the intention of the Publishers to produce a com- 

 plete series of Scientific Manuals, affording full and ac- 

 curate elementary information, conveyed in clear and 

 lucid English. The authors are well known as among 

 the foremost men of their several departments ; and their 

 names form a ready guarantee for the high character of the 

 books. Subjoined is a list of those Manuals that have 

 already appeared, with a short account of each. Others 

 are in active preparation ; and the whole will constitute a 

 standard series specially adapted to the requirements of be- 

 ginners, whether for private study or for school instruction. 

 ASTRONOMY, by the Astronomer Royal. 



POPULAR ASTRONOMY. With Illustrations. By SIR G. B. 



AIRY, K.C.B., Astronomer Royal. New Edition. i8mo. 



cloth. 4-r. 6d. 



Six lectures, intended "to explain to intelligent persons the principles 

 on -which the instruments of an Observatory are constructed, and the 

 principles on -which the observations made with these instruments are 

 treated for deduction of the distances and weights of the bodies of the 

 Solar System, " 



ASTRONOMY. 



ELEMENTARY LESSONS IN ASTRONOMY. With 

 Coloured Diagram of the Spectra of the Sun, Stars, and 

 Nebulae, and numerous Illustrations. By J. NORMAN LOCKYER, 

 F.R.S. New Edition. i8mo. $s. 6d. 



" Full, clear, sound, and worthy of attention, not only as a popular expo- 

 sition, but as a scientific 'Index.'" ATHEN^UM. " The most fasci- 

 nating of elementary books on the Sciences" NONCONFORMIST. 



