24 VARIATION 



ADDITIONAL REFERENCES 



ANIMALS AND PLANTS UNDER DOMESTICATION. By Charles Darwin. 

 2 vols. 



DISCONTINUOUS VARIATION. (An example.) By E. R. Saunders. Pro- 

 ceedings of the Royal Society, LXII, 11-25. 



ORIGIN OF SPECIES BY MEANS OF NATURAL SELECTION. By Charles 

 Darwin, i vol. 



THEORY OF ORGANIC VARIATION. By H. S. Williams. Science, VI, 



73-84. 

 TYPE, How FIXED. (On genetic energy of organisms. Is variability and 



not permanency the normal law of organic life?) By H. S. Williams. 



Science, VII, 721-729. 

 VARIATION AND SOME PHENOMENA CONNECTED WITH REPRODUCTION 



AND SEX. By Adam Sedgwick. Science, XI, 881-894, 923-930. 

 VARIATION DISCONTINUOUS. ' (Study of a recent variety of flatfish.) By 



H. C. Bumpus. Science, VII, 197. 

 VARIATION IN PLANTS. (A study of the portions of a leaf on which chlo- 



' rophyll is found.) Experiment Station Record, XIII, 423. 

 VARIATION IN TRILLIUM GRANDIFLORUM. (A record of the variations 



observed in 185 cases.) By H. W. Britcher. Maine Experiment 



Station Bulletin No. 86, pp. 169-196 ; also Experiment Station Record, 



XIV, 634. 



