AUTHOR S ABSTRACT OF THIS PAPER ISSUED 

 BY THE BIBLIOGRAPHIC SERVICE, AUGUST 7 



A STUDY OF THE RELATION OF THE BEHAVIOR OF 



THE CHROMATIN TO DEVELOPMENT AND 



HEREDITY IN TELEOST HYBRIDS^ 



EDITH PINNEY 



EIGHTY-EIGHT FIGURES 



INTRODT/rCTION 



The facility with which crosses between distantly related 

 species of teleosts can be made and the varied results obtained 

 from such crosses offer a problem which has received much at- 

 tention from zoologists in recent years. Although the researches 

 of Moenkhaus, Newman, the Hertwigs, and others have con- 

 tributed to the solution of certain phases of the problem w^iich 

 concern the unlike results of reciprocal crosses and the differences 

 in development shown by the individuals of any one cross, the 

 explanations of these workers are more in the nature of suggested 

 hypotheses than proved theories. It was in view of the need for 

 further investigation of the cytology of these hybrids that this 

 study, which deals with the behavior of the chromosomes of 

 several heterogeneous crosses, was undertaken. 



The behavior of the chromatin in teleost hybrids was first 

 described by IMoenkhaus in 1904 in reciprocal crosses between 

 Fundulus heteroclitus and Menidia notata. He demonstrated 

 that the chromosomes of both of these species retained their 

 morphological characteristics when brought together by cross 

 fertihzation, and his results afford splendid support to Boveri's 

 hypothesis of the individuality of the chromosomes. None of 

 the hybrids survived the early germ-ring stages and, although 

 the chromatin was followed through several of the early and the 



^ A dissertation presented to the faculty of the Graduate School of Bryn Mawr 

 College in partial fulfillment of the requirements for the degree of Doctor of 

 Philosophy. For assistance in publishing the illustrations accompanying this 

 paper I am indebted to the Naples Table Association for Promoting Laboratory 

 Research by Women. 



225 



JOURNAL OF MORPHOLOGY, VOL. 31, NO. 2 

 SEPTEMBER, 1918 



