Medical and Philosophical News

THE Society of Arts and Sciences at Utrecht have propofed the following queftion for a prize of thirty ducats: " Is the planting of trees in great towns and their environs falutary, or hurtful to the health of the inhabitants j Do their exhalations purify or corrupt the air; and what fpecies of trees do the molt, or the leafl good or harm ? The diffcrtationsareto be fentto M. Van-Haeften, Secretary to the Society, before the ift of December