HISTORY OF CHROMOSOMAL VESICLES IN FUNDULUS. 28 1 



which come together in the telophase. Although they are closely 

 applied to each other in the resting nucleus, they still maintain 

 their unity of structure. When the nucleus begins the next 

 division the new chromosomes are produced endogenously, each 

 within the substance of one of the old vesicles which persists 

 until the new chromosome is well formed. Thus there is clearly 

 a continuity of substance from the old to the new metaphase 

 chromosome. These observations establish clearly the genetic 

 continuity of the chromosomes for this case and the evidence 

 in general is so strong that the fact may be held as of wide ap- 

 plication. The preceding account gives in detail the facts as ob- 

 served in the mitoses of Fimdulus eggs, a general summary of 

 the occurrence of chromosomal vesicles and the relation of other 

 cases to the present one, and finally a general statement of the 

 present status of the theory of genetic continuity of chromosomes 

 with the main points of evidence for it. 



REFERENCES. 



This list includes only references not given in the table on page 272 citing the 

 occurrence of chromosomal vesicles. 

 Bonnevie, K. 



'08, 'n Chromosomenstudien I., II. and III. Arch. f. Zellf., Bd. I., II. and VI. 

 Boveri, Th. 



'88 Die Befruchtung und Teilung des Eis von Ascaris megalocephala. Jena, 



1888. 

 Boveri, Th. 



'09 Die Blastomerenkerne von Ascaris megalocephala und die Theorie der 



Chromosomenindividualitat. Arch. f. Zellf., 3. 

 Carothers, E. Eleanor. 



'13 The Mendelian ratio in relation to certain orthopteran chromosomes. 



Jour. Morph., 24. 

 Child, C. M. 



'n The method of cell division in Moniezia. BIOL. BULL., XXI. 

 Conklin, E. G. 



'01 The individuality of the germ nuclei during the cleavage of Crepidula. 



BIOL. BULL., II. 

 Conklin, E. G. 



'02 Karyokinesis and cytokinesis. Jour. Acad. Nat. Sci. Phila., 12. 

 Federley, H. 



'13 Das Verhalten der chromosomen bei der spermatogenese der Schmetter. 



linge. Zeit. Abst. Vereb., IX. 

 Gregoire, V. 



'06 La structure de 1'element chromosomique au repos et en division dans les 

 cellules vegetales. La Cellule, XXIII. 



