G. L. Taylor

Performance of Blood-group Tests.

may show small pockets at intervals where egg-laying probably occurs. When the track through the skin is located the cedarwood oil is wiped off with xylol and the parts cleaned with ether or spirit. Using the eye-spud, the track is then laid open to its terminus, taking care not to draw blood, which obscures visibility. The drops of clear fluid in the burrow are transferred to a slide and covered with a cover-slip for examination under an ordinary microscope. A drop of distilled water on a clean slide prepared with Mayers egg albumen facilitates the procedure. In this way I was successful in obtaining what appear to be four stages in the development of a