1. Technique.

A map measure (K & E) has been found very useful in measuring the length of chromosomes. By tracing the camera lucida drawing with the map measure the length (in inches or centimeters) is registered on the dial of the measure. This is useful in determining arm lengths and relative lengths of the chromosomes. The map measure was suggested by an engineer, George W. Burke, on an FERA project here at the Experiment Station.