"Yes," I answered.
"Then," said my companion, "make no further investigations in this direction."
"But I wish to verify the experiment," I replied. "Although it is not a pleasant test, I can not withstand the temptation to repeat it."
And again I moved the candle backward and forward, when the figure of my brain sprung at once into existence.
"It is more vivid," I said; "I see it plainer, and more quickly than before."
"Beware of the science of man, I repeat," he replied; "now, before you are deep in the toils, and can not foresee the end, beware of the science of human biology. Remember the story recently related, that of the physician who was led to destruction by the alluring voice."
I made no reply, but stood with my face fixed, slowly moving the candle backward and forward, gazing intently into the depths of my own brain.
After a time the old man removed the candle from my hand, and said: "Do you accept the fact? Have I demonstrated the truth of the assertion?"
"Yes," I replied; "but tell me further, now that you have excited my interest, have I seen and learned all that man can discover in this direction?"
"No; you have seen but a small portion of the brain convolutions, only those that lie directly back of the optic nerve. By systematic research, under proper conditions, every part of the living brain may become as plainly pictured as that which you have seen."