LETTERS Plastic Sulfur
To the Editor: The way making plastic is to boil some in a test tube and then pour the boiling contents around the walls of a glass funnel immersed in cold water. I found that it is more spectacular to plunge the hot test tube and its contents into cold water. The tube cracks in hundreds of places but
doesn't fall apart, because of the plastic sulfur in the cracked tube. Then, when the tube is cool, it becomes a simple yet impressive matter to stretch the test tube, thereby proving to the students the rnbber-like property of plastic sulfur. Max EPSTEIN HmsN Hron ScnooL MANHATTAN. NEW YORK
