Joe busied himself with mixing the chemicals in the pail. As Ham Logan had guessed, the young fire-eater was mixing up a solution of tungstate of soda. This chemical is a salt, made by roasting wolfram with soda ash, and wolfram is a native tungstate of iron and manganese. This soda preparation is used commercially in making garments fire-proof, and Joe had learned this from Mr. Herbert Waldon, the chemist. He had decided to use this instead of an alum solution, which is credited with great fire-resisting qualities. It has them, too, to a certain extent, but by experimenting Joe had found the tungstate of soda best.
It was the evening of the circus in the city in which the show was to remain two days. Ham Logan had returned to Joe after having eaten a good meal, and later Bill Watson formed the third member of a trio that talked for some time in a corner of Joe's tent.
As already said, it was the evening performance, and as Helen finished her act on Rosebud she looked over toward the place where Joe was preparing to do his slide down the slanting wire.
"I wonder what he had in mind as a new act for me," mused Helen. "I do hope it isn't anything to do with fire. That sort of stunt creates a sensation, but it's dangerous, in spite of what Joe does to himself. I don't like it! Not after what happened to Joe that day!"
She had seen that Rosebud was given in charge of the groom who always looked after the clever steed, and now Helen moved over where she could watch Joe's comparatively new wire act.
As she approached this part of the circus tent Helen was startled to see several men carrying large hoops on long poles, take their positions on either side of the slanting wire down which the daring performer was soon to slide on his head, by means of the wheeled cap.
"That's something new!" exclaimed Helen, as she saw the men with the big hoops. "I wonder if Joe is going to jump through them, as I jump through the paper hoops from Rosebud's back?"
Joe was up on the little platform now, having finished his wire act. He was adjusting to his head the leather cap.
"Ladies and gentlemen!" began Jim Tracy in his sonorous voice, as he pointed to Joe on his high perch, thus calling attention to the performer.