In the past time Philadelphians have seen the value of trees in cities. The legacy of Elliot Cresson, which was bequeathed in 1857, provides as fol-lows: "I give and bequeath to the Mayor and community of Philadelphia the sum of $5,000, in trust, as a perpetual fund, the income of which I desire shall be annually, forever, expended in planting and renewing shade trees, especially in situations now exposing my fellow-citizens to the heat of the sun." The will of Andre Francois Michaux, of Vaureal, near Pontoise, France, dated September 4, 1855, bequeathes the sum of $12,000 to be divided equally between the American Philosophical Society of Philadelphia and the Society of Agriculture, Art, etc., of Boston, Mass. Of late years city trees are rapidly being destroyed by the neglect of the gas companies to make the mains gas-tight, the leakage under ground destroys the roots. It would seem that those who have the above legacies in charge might take some interest in this gas-killing question. It is as useful to preserve a tree after it is planted as to get one planted in the first place.