3G8 PRINCIPLES OF ANIMAL BIOLOGY 



seem entirely possible^ that he .shouhl guides liis ()^\'n. The .science of 

 eugenics aims at impr()\'ement of the race by such methods. Assuming 

 that man can judge correctly which of his qualities are most desirable 

 and that he can subordinate his emotions to his reason, there is no appar- 

 ent obstacle to progress as far as his present genes and future mutations 

 make possible. How great this progress may be it is futile to estimate, 

 for no one knows what new qualities may arise through interaction of 

 genes already in existence, and certainly no one can guess what genes 

 will mutate or how. Predictions regarding man's future evolution are 

 accordingly meaningless. 



References 



Darwin, Charles. The Origin of Species. D. Appleton-C'ontury ("ompany, Inc. 



(Chap. XIV, recapituhition.) 

 Darwin, Charles. Variation of Animals and Phmts under Domestication. D. 



Appleton-Century Company, Inc. (Introduction, a general outline of argument 



for natural selection.) 

 DoBZHANSKY, T. Clcnetics and the Origin of Species. Columbia University Press. 

 Ford, E. B. Mendelism and Evolution. Dial Press (Lincoln MacVeagh), Inc. 



(Chap. IV, evolution through the selection of mutations.) 

 Haldane, J. B. S. The Causes of Evolution. Harper & Brothers. (Chap. V, the 



nature of adaptation.) 

 Lull, R. S. Organic Evolution. 1929 Ed. The Macmillan Company. (Chaps. 



XIX-XXIV, various types of adaptations; book lacks modern viewpoint on 



factors of evolution.) 

 Morgan, T. H. The Scientific Basis of Evolution. W. W. Norton <fe Company, 



Inc. (Chap. V, adaptation and natural selection; Chap. VI, nuitation.) 

 Newman, H. H. Readings in Evolution, Genetics and Eugenics. University of 



Chicago Press. (Chap. XVII, criticism of natural selection.) 

 Scott, W. B. The Theory of Involution. The Macmillan Company. (Chap. I\', 



evidence from paleontology.) 

 Shull, a. F. Evolution. McGraw-Hill Book Company, Inc. 



