GENETICS OF HETEROMORPHIC CHROMOSOMES 473 



E. G. Conklin ('20) closes a recent article on the mechanism of 

 evolution with the following sentence: ^'We may therefore con- 

 clude that the Mendelian law of heredity, especially as regards 

 segregation of inheritance factors is of universal occurrence — 

 that there is no other type of inheritance." 



LITERATURE CITED 



(All other works referred to are listed in my 1917 paper) 



Carothers, E. Eleanor 1917 The segregation and recombination of homolo- 

 gous chromosomes as found in two genera of Acrididae (Orthoptera). 

 Jour. Morph., vol. 29. 



GoNKLiN, E. G. 1920 The mechanism of evolution in the light of heredity and 

 development. Sci. Monthly, vol. 10. 



Harmon, Mart T. 1920 Chromosome studies in Tettigidae. II. Chromosomes 

 of Paratettix BB and CC and their hybrid BC. Biol. Bull., vol. 38. 



McClung, C. E. 1917 The multiple chromosomes of Hesperotettix and Mer- 

 miria (Orthoptera). Jour. Morph., vol. 29. 



Morgan, T. H. 1916 A critique of the theory of evolution. Princeton Univ. 

 Press. 



Nabours, Robert K. 1914 Studies of inheritance and evolution in Orthop- 

 tera I. Jour. Gen., vol. 3. 



1917 Studies of inheritance and evolution in Orthoptera II and III. 

 Jour. Gen., vol. 7. 



Wenrich, D. H. 1917 Synapsis and chromosome organization in Chorthippus 

 (Stenobothrus) curtipennis and Trimerotropis suffusa (Orthoptera). 

 Jour. Morph., vol. 29. 



