<div class="htmlview paragraph">Since the Navy's habitat is the ocean area of the world, sea water is an environmental factor which must be reckoned with and, if possible, used to advantage where lubrication of ship' s machinery is concerned. Three situations within the above concept are (<span class="xref">1</span>) protection from the environment, (<span class="xref">2</span>) utilization of the environment, and (<span class="xref">3</span>) adaptation of the environment. Illustrations of the above as related to propulsion machinery and some related equipment are found in (<span class="xref">1</span>) need for more effective protection against sea water intrusion in turbine and hydraulic systems, (<span class="xref">2</span>) certain specific applications using bearings lubricated by sea water only, and (<span class="xref">3</span>) potential improvement in the use of sea water as a lubricant.</div>