SCIENTIFIC CATALOGUE. 



three books contain a series of theorems and of problems on the laws 

 of motion of dementary substances. In the sixth and seventh, the 

 mechanical constitution of molecules is investigated and determined: 

 and by it the general properties of bodies are explained. The eighth 

 book.treats of luminiferous etlier. The ninth explains some special 

 properties of bodies. The tenth and eleventh contain a radical and 

 lengthy investigation of chemical principles and relations, which 

 may lead to practical results of high importance. The twelfth and 

 last book treats of molecular masses, distances, and powers. 



Boole. — Works by G. Boole, D.C.L, F.R.S., Professor of 

 Mathematics in the Queen's University, Ireland : — 



A TREATISE ON DIFFERENTIAL EQUATIONS. Third 

 Edition. Edited byl. Todhunter. Crown 8vo. cloth. 14J. 

 Professor Boole has endeavoured in this treatise to convey as complete 

 an account of the present state of knowledge on the subject of Dif- 

 ferential Equations, as was consistent with the idea of a work in- 

 tended, primarily, for elementary instruction. The earlier sections 

 of each chapter contain that kind of matter which has usually been 

 thought suitable for the beginner, while the latter ones are devoted 

 either to an account of recent discovery, or the discussion of such 

 deeper questions of principle as are likely to present themselves to the 

 reflective student in connection with the methods and processes of his 

 previous course. ' ' A treatise incomparably superior to any other 

 elementary book on the subject with which we are acquainted" — 

 Philosophical Magazine. 



A TREATISE ON DIFFERENTIAL EQUATIONS. Supple- 

 mentary Volume. Edited by I. Todhunter. Crown 8vo. cloth. 

 %s. 6d 



This volume contains all that Professor Boole wrote for the purpose 

 of enlarging his treatise on Differential Equations. 



THE CALCULUS OF FINITE DIFFERENCES. Crown 8vo. 



cloth, los. 6d. New Edition revised. 



In this exposition of the Calculus of Finite Differences, particular 

 attention has been paid to the connection of its methods with those of 

 the Differential Calculus —a connection which in some instances 

 involves far more than a merely formal analogy. The work is in 

 some measure designed as a sequel to Professor BooUs Treatise on 

 Differential Equations. 



