MODERN SCIENCE SERIES. 



Edited by Sir JOHN LUBBOCK, Bart., M. P. 



L The Cause of an Ice Age. 



By Sir ROBERT BALL, LL. D., F. R. S. 



H. The Horse: 



A Study in Natural History. 

 By WILLIAM HENRY FLOWER, C. B., 

 Director of the British Natural 

 History Museum. 



in. The Oak: 



A Popular Introduction to Forest 



Botany. 

 By H. MARSHALL WARD, F. R. S. 



In press : 



IV. The Laws and Properties of Mat- 

 ter. 



By R. T. GLAZEBROOK, F. R. S., Fellow 

 of Trinity College, Cambridge. 



New York : D. APPLETON & Co., 1, 3, & 5 Bond St. 



