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INTRODUCTION. 17 
densed form the evidences in favor of the Evolution of Life, 
and its offering Natural Selection as a cause of this Evolution. 
We will not dwell now on Natural Selection, as we endeavor 
to explain it in a chapter devoted to that subject. It seems 
proper, however, to mention that the discovery of Natural 
Selection was made independently by Mr. Wallace, who, 
having spent seven years in the Malay Ar hipelago, sent a 
paper to London containing his views on the Origin of 
Species. Following the advice of mutual friends, Mr. 
Darwin brought forward an abstract of his views, and the 
two papers appeared simultaneously in the publications 
of the Linnzan Society. Since the publication of the 
Origin of Species, many works have appeared in which this 
subject is discussed more or less in detail, among which 
may be mentioned the later ones of Messrs. Darwin and 
Wallace; the General Morphology and Natural History of 
E ron, by Prof. Haeckel; the Principles of Biolog gy, by 
Mr. Herbert Spencer; the various works of Dr. Büchner ; 
the Origin of Species, etc., by Prof. Huxley ; the e ed 
tion to the Flora of i MN by Sir William Hooker; 
the Comparative Anatomy of Prof. Gegenbauer; the Chis: 
tacea of Fritz Miller; the different papers by Prof. Cope, 
E. etc. 
Hoping now to have made clear the general object of 
our essay, to have shown how gradual has been the devel- 
opment of the theory of the Evolution of Life, and having 
merely noticed some of the important literature on the 
subject, we pass on to the consideration of the Evidences, 
the Causes, and the Consequences of this Evolution. 
