With a stick shaped something like the wooden shovels used at the seashore, he dipped into the milky juice in the bowl, then turned this stick or paddle around very rapidly in the smoke until the juice baked on the paddle. He then added more juice and went through the same operation again and again until there were between five and six pounds of rubber baked on this paddle. He then cuts this off with a wet knife which made it cut more rapidly. That formed what is called a rubber “biscuit,” and he then started over again for his next five or six pounds. Later, as the demand for these “biscuits” increased, instead of the native using the paddle, he erected two short fence-like affairs about six feet apart, but parallel with each other, and in between was the smoky fire. Then he obtained a long pole, stretched it across these two rails and poured a small quantity of this juice on this pole, over where the smoke came in contact with it, and rolled the pole around until this juice was baked, adding more, until, instead of a small five- or six-pound “biscuit,” he would get an immense ball. In order to get this off his pole, he would jog one end of the pole on the ground until the “biscuit” would slide off. This is the way crude rubber first came into our market and the way it comes today. [Illustration: SMOKING RUBBER--UPPER AMAZON _Courtesy of the United States Rubber Co._] How was Vulcanizing Discovered? Up to this time, these “biscuits,” when exposed to heat, would become very soft and sticky, and when exposed to the cold, would become hard like a stone. [Illustration: REMOVING BISCUIT FROM POLE AFTER SMOKING _Courtesy of the United States Rubber Co._] There was an American by the name of Charles Goodyear who had heard how the natives of the rubber-growing countries used this milky juice in many ways for their own benefit. One use they put it to was the waterproofing of their cloaks. How could this be done so that our clothing would be made water-tight and yet not be sticky in summer or stiff in winter? Goodyear devoted a great deal of his time to solving this problem, and, like many other great inventors, he passed through many trials. His many failures caused his friends to forsake him and he was put in prison for not paying his debts. He persisted in his quest, however, and it was accident at last that opened the way to discovery of the processes of vulcanization for which Goodyear was seeking. [Illustration: INDIAN WATERPROOFING CLOTH BY “PAINTING” IT WITH RUBBER “MILK”--BRAZIL _Courtesy of the United States Rubber Co._]