Chromosome Structure in Drosophila

Abstract
A preliminary report describing the existence of chromonemata in the chromosomes of D. melanogaster and D. virilis. Chromosomes of permanent spireme-nuclei of the salivary glands are figured, but chromonemata have been observed during somatic and meiotic mitoses. It is suggested that the presence of chromonemata may aid in explaining the discrepancies occurring between the genetical and cytological maps of D. melanogaster.