Abstract

IT is perhaps unnecessary for me to inquire into the reasons for the assumption that the evidence from dicentric bridges in Tragopogon is incompatible with the existence of a telophase split in Todea, for the suggestion that the chromosome figured by me was a dicentric is not borne out by anything in the specimen itself. The accompanying diagram, based on my previously published photograph b, shows the region referred to. The two distorted chromosomes are labelled chr 1 and chr 2, chr 1 being that under discussion. In it “two distinct and separate threads have been forced widely asunder”, the separation starting at a point near the intersection with chr 2 (which is not otherwise of interest) and continuing to the distal extremity of the chromosome. Near this end both threads experience a sudden bend and the only point of uncertainty is whether or not they also cross over each other at this point.