"Color of Daylight? Why, I supposed it was white."
"But the light of the glow worm and fire fly are not white."
They watched them, and soon appreciated that John's statement was true.
"You asked what were some of the things to be solved? Well, to find out the secret of the phosphorescent glow. That is one thing. What is the best artificial light, is the next. Then, what substance will have the most intense glow when a current passes through it, and give out the least heat."
"Well, has no one attempted to explain any of these things?"
"Yes; many explanations have been offered, but all of them leave the subject dark somewhere." And John laughed as he saw that the boys appreciated his little attempt at witticism.
"But the time will come when man will find out this, as everything in his way. When you think of it, that electricians, chemists, metallurgists, physiologists, engineers, physicists and microscopists, are all working on the problem, we should be able to extract the secret sooner or later."
"I am going to have some of those fellows," shouted George, and when the natives on board heard the request of George there was a scramble for the boats, and John was delighted to give them instructions for capturing the insects.
Early the next day the entire party landed, and Blakely, together with John and the boys, started for the high peak, the one visible for miles from the west, and which John and the boys often wished to visit.