Speculations as to the future history and applications of these wonder-working bodies press upon even the dullest imagination; if a few grams of earth-born material, containing only a small percentage of the active body, emit light enough to affect the human eye and a photographic plate, as well as rays that penetrate with X-ray power, what degree of luminosity, of actinism and of Röntgenism (if the term may be allowed), is to be expected from an hundred weight of the quintessence of energy purified from interfering matter? And to what uses is this light-generating material to be applied? Are our bicycles to be lighted with discs of radium in tiny lanterns? Are these substances to give us the ‘cheapest form of light?’ Are we about to realize the chimerical dream of the alchemists?
Seriously, in what direction is profound study of these substances going to lead us? Will it not greatly extend our knowledge of physical manifestations of energy and their correlation? In what corner of the globe will be found the cheap and convenient supply of the raw material yielding the radio-active bodies? Will not chemists be obliged to re-examine much known material by laboratory methods conducted in the dark? Many of us have worked up pounds of pitchblende to extract the uranium oxids, and in so doing have poured down the waste-pipe or thrown into the dust-bin the more interesting and precious bodies.
Whatever the future may bring, scientists are deeply indebted to Becquerel and to Mme. and M. Curie for placing in their hands new methods of research and for furnishing a novel basis for speculation destined to yield abundant fruits.
DISCUSSION AND CORRESPONDENCE.
WASHINGTON AS AN EXPLORER AND SURVEYOR.
Washington was a surveyor and explorer before he entered upon the fields of war and statecraft, and his honesty of purpose, sincerity of action and accuracy of statement and method, so manifest throughout his career as a soldier and statesman, are found also in the earlier record. At the age of sixteen he crossed the Blue Ridge on horseback and made a series of successful surveys in the Shenandoah valley, overcoming physical obstacles with the method and system of a modern scientist. At twenty-two he led a party into the wilderness of the valley of the Ohio to treat with the French and Indians. He then became acquainted with the great resources of the interior, and saw that the valleys of the James and Potomac afforded unusual facilities for lines of transportation for the trade ‘of a rising empire.’ In 1754 he reported in favor of a scheme of communication between the Atlantic states and the great west. Sixteen years later he suggested that the project of opening up the Potomac be ‘recommended to public notice.’ The idea contained in the Potomac scheme was of far-reaching import, and only the present generation can fully realize its significance.
Washington was not only the first to map and recommend the general route of the great highways called the National Pike and the Chesapeake and Ohio Canal, which are now in truth ‘becoming the channels of conveyance of the extensive and valuable trade of a rising empire,’ but he was also the first to predict the commercial success of that route through the Mohawk valley which was afterwards taken by the Erie Canal and the New York Central Railroad.
One hundred and fifteen years ago he asked: “Would it not be worthy of the wisdom and attention of Congress to have the western waters well explored, the navigation of them fully ascertained and accurately laid down, and a complete and perfect map made of the country.... The advantages would be unbounded, for sure I am that nature has made such a display of her bounties in those regions that the more the country is explored the more it will rise in estimation, consequently greater will the revenue be to the Union.” Again he declared, “I shall not rest contented until I have explored the western country and have traversed those lines which have given bounds to a new empire.”