Abstract
The retarding effect of the war on the execution of the normal program of the Department has again made itself felt during the year. Communications between countries have become more and more difficult and scientific research has been progressively orientated to meet the requirements of modern war. Many established organizations and observatories have found it possible to maintain a part, if not the whole, of their normal activities and accordingly the loss of continuity of accumulating data on land has not been total. Naval operations, on the other hand, have precluded the collecting of observations at sea, thus preventing the maintenance of isomagnetic charts upon which navigation and some phases of the activities of war depend. The investigation of special war‐problems, however, has resulted in the development of many items of scientific value.
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