i6 EDUCATIONAL BOOKS. 



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



"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. %s. 6d. 

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SCIENCE. 



ELEMENTARY CLASS-BOOKS. 



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ASTRONOMY, by the Astronomer Royal. 



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



Airy, K.C.B., Astronomer Royal. New Edition. l8mo. 



cloth. 4J. 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 

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