Most of us who have had some experience at sea on small power or sailing boats have noted that the sea surface is crossed by usually more than a single train or set of waves. Each train can be identified by its direction, ...

While studying the correlations between the distribution of five species of beach hoppers of the genus Orchestoidea and the physical and biotic factors of their sandy beach habitat, it became necessary to identify with ...

In our analysis of the effect of ionizing radiation upon the cleavage of sea urchin zygotes we found it necessary to take successive photomicrographs of a large number of eggs, in different samples, which had been ...