Direction communication experiments, when controlled against unilateral visitation of trained foragers at the experimental site, exhibited no evidence supporting the precision of communication suggested in the dance "language" hypothesis. Results compare well with those which might be expected on the basis of the geometric arrangement of the feeding dishes.

The direction of evolution may at times be determined by the internal selection of genotypes during development, rather than by the external selection of phenotypes. Biological theory and experiment have reached the point where those concerned with evolutionary problems or with nuclear and cellular organization should consider this possibility.

Precipitative mixing experiments have been conducted with the aid of a turbidimeter and a darkfield microscope. The results of these experiments, correlated with observations of macroscopic features, indicate that serological precipitation is largely governed by a highly specific mechanism except in the terminal period, when the operation of non-specific forces ...

The percentages of microorganisms killed with emulsept in these experiments for the same series of eggs are many times greater than the percentages of those killed when 100 ppm active chlorine was used. Experiments are in progress on other phases of this problem.