THE 



Ohio Journal of Science 



PUBLISHED BY THE 



Ohio Statk Univkrsity Scientific Society 

 Volume XVII NOVEMBER, 1916 No. 1 



TABLE OF CONTENTS 



Shull — Cytoplasm and Heredity 1 



OSBORN AND DRAKE — Some New Species of Nearctic Tingidae 9 



Weston — A Monstrosity in Trillium Grandiflorum 16 



HiNE — Description of Robber Flies of the Genus Erax 21 



News and Notes 23 



CYTOPLASM AND HEREDITY.* 



A. Franklin Skull. 



It is too much to say that the days of controversy in biology 

 are past. Yet most of us are now content to play the role of 

 judge and jury, and abandon the less dignified role of advocate. 

 I shall not, therefore, attempt to refute the arguments of my 

 predecessors as a necessary preliminary to advancing evidence 

 of exceptions. It may be granted that the work of Morgan, 

 Bridges, Sturtevant, MuUer and others, upon the fruit fly 

 Drosophila, has demonstrated that differential factors of hered- 

 ity lie in the chromosomes. Those who take comfort in the 

 thought that these factors may lie in other bodies (perhaps 

 cytoplasmic), which behave like chromosomes, but which can not 

 be observed, and about which nothing is known, not even that 

 they exist, may take that comfort without injury to any one 

 but themselves. They are in the position of that famous 

 student of heredity who, after a lifetime of biometric work, 

 naively remarked that he saw nothing in the Mendelian work 

 of the present century which refuted a single jot or tittle of his 

 conclusions, but who did not think it worth while to admit that 

 not a few of those conclusions, while still true, had, in the light 

 of the newer work, become practically useless. They are 

 putting new wine in old bottles. 



*The concluding paper of a symposium on the mechanism of hereditj^ held 

 by the Biological Conference of the Michigan Schoolmasters' Club, March 31,1916. 



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