ABSTRACT
OUR primary concern throughout this book has been with problems involved in making observations and measurements within the marine environment: attention has, therefore, been focused particularly on methods by which a great variety of instruments can’ be made to function properly in the sea. This section may, then, appear somewhat anomalous since, as the title indicates, it concerns a technique where the instruments are quite clearly remote from the sea. Although aerial photographs have sometimes been used to illustrate various aspects of marine biological studies-in particular those of the intertidal zonecomparatively recent developments have shown that the potentialities of this method are greater than had been realized.
