f 



With the compliments of 



^ EDM, B. WILSON, 



COLUMBIA UNIVERSJTY, NtW YC 



STUDIES ON CHROMOSOMES 



IV THE "ACCESSORY" CHROMOSOME IN SYROMASTES AND 



PYRROCHORIS WITH A COMPARATIVE REVIEW OF 



THE TYPES OF SEXUAL DIFFERENCES OF 



THE CHROMOSOME GROUPS 



By 

 EDMUND B. WILSON 



RETURN TO 



DIVISION OF GENETICS 



HILGARD HALL 



REPRINTED FROM 



THE JOURNAL OF EXPERIMENTAL ZOOLOGY 



Volume VI No. i 



JANUARY, 1909 



BALTIMORE, MD., U. S. A. 

 WILLIAMS & WILKINS COMPANY 



