SCIENCE-ADVERTISEMENTS 



THE 

 PRINCIPLES OF 

 STRATIGRAPHY 



BY 

 AMADEUS W. GRABAU, S.M.. S.D. 



PROFESSOR OF PALEONTOLOGY IN 

 COLUMBIA UNIVERSITY 



"Should be on the reference shelf of every col- 

 lege, normal school, and large high school in the 

 United States." — Journal of Geography, Vol. XI Hi 

 Jan. 1915. 



8vo. 1150 pages, 264 illaslratiom. Price, $7.50 



Descriptive Circular Sent upon Request 



k. G. SEILER 8l CO. 



NEW YORK CITY 



THEORY OF INVARIANTS 



By OLIVER E. GLENN 



The XJniversity of Pennsylvania 



254 pages With. Diagrams. 



S2.75 



A book of ten chapters, which aims in 

 moderate space to give an adequate intro- 

 duction to the study of original memoirs. 

 The Aronhold sjonbolism is introduced early 

 in the course, but much emphasis is placed 

 upon the methods of the "great English 

 mathematicians. 



Tiie chapter titles are: I, The Principles 

 of Invariant Theory ; II, Properties of In- 

 variants ; III, The Processes of Invariant 

 Theory; IV,Reduction; V,Gordan's Theorem ; 

 VI, Fundamental Systems; VII, Combinants 

 and Rational Curves; VIII, Seminvariants. 

 Modular Invariants; IX, Invariants of 

 Tenary Forms ; X, Appendix ; Theorems 

 and Exercises. 



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