MUTATIONS 



139 



Mutants, like their parent types, are subject to fluctuating 

 variability, which is a necessary law of reproduction, and they 

 may be improved that is, shaped up by judicious selec- 

 tion, but their principal characters and main trend were fixed 

 when the type arose. 



ADDITIONAL REFERENCES 



ALBINISM. (A critical study of its causes.) By E. Pantanelli. Experiment 

 Station Record, XV, 55. 



ATAVIC MUTATION OF THE TOMATO. By C. A. White. Science, XVII, 

 76-78, 234-235. 



ATAVISM IN THE POTATO. By S. Rhodin. Experiment Station Record, 

 XI, 710. 



DETERMINATE MUTATIONS. (De Vries and others quoted.) By M. M. 

 Metcalf. Science, XXI, 355-356. 



EVOLUTION AND ADAPTATION. By T. H. Morgan. Science, XIX, 

 221-225. 



EVOLUTION WITHOUT MUTATION. By C. B. Davenport. Science, XIX, 215. 



INHERITANCE OF MONSTROSITIES. (Experiments of twelve years.) By 

 Hugo De Vries. Experiment Station Record, XI, 546. 



MUTATION AND SELECTION. (What causes mutations ? Are they all in 

 one direction?) By M. M. Metcalf. Science, XIX, 75-76. 



MUTATION IN THE TOMATO. By C. A. White. Science, XIV, 841-844. 



MUTATION .THEORY. (A review of Species and Varieties.) By C. B. Daven- 

 port. Science, XXII, 369-372. 



MUTATION THEORY OF DE VRIES. (Twenty-eight lectures by the author 

 at the University of California, 1904.) Experiment Station Record, 

 XVI, 745- 



MUTATION THEORY OF DE VRIES. By D. T. McDougal. Experiment 

 Station Record, XIII, 324-619; XIV, 226, 526. 



MUTATION THEORY OF ORGANIC EVOLUTION. (A brief but pointed sur- 

 vey of the subject.) By W. E. Castle of Harvard University. Science, 

 XXI, 521-543; from standpoint of animal breeding, 521-524; from 

 standpoint of cytology, 525-528. 



MUTATIONS IN PLANTS. By D. T. McDougal. American Naturalist, 

 XXXVII, 737-770; also in Experiment Station Record, XVI, 23. 



ORIGIN OF SPECIES. By Hugo De Vries. Science, XV, 721-729. 



ORIGIN OF SPECIES THROUGH SELECTION CONTRASTED WITH THEIR 

 ORIGIN THROUGH APPEARANCE OF DEFINITE VARIETIES. By T. H. 

 Morgan. Popular Science Monthly, LXVII, 54-66. 



PREPOTENCY OF INDIVIDUALS WITH ABNORMAL VARIATION OR MUTA- 

 TION. (A study of cats with extra toes.) By H. B. Torrey. Science, 

 XVI, 554-555- 



