Hasps and padlocks enabled the experimenter to lock this "lid" after food had been placed in the center of the box.

Julius took to backing into the chosen box so that he could face the experimenter.

A few minutes later, he again led the experimenter toward the banana, but receiving discouragement in this activity, he proceeded to devote himself to other methods.

They would look the experimenter directly in the eye, and they usually gazed intently at anything, such for example as the bait, that interested them.

Particularly we should mention two American experimenters, Dr. de Forest and Professor Fessenden.

His telephone receiver provided the wireless experimenters with an instrument of extreme sensitiveness by which they were able to detect currents which the mirror galvanometer could not receive.

Narcissus had been persuaded to send the drawings to London to be treated by lithography, a process of which he knew nothing, but to which M. Raoul, during his studies in Paris, had given much attention, and apparently not without making some discoveriesunimportant perhaps, and such as might easily reward an experimenter in an art not well past its infancy.

Of the two ordinarily with us one was much the younger; and whenever we came to an unusually doubtful- looking ford or piece of boggy ground the elder man always sent the younger one on and sat on the bank until he saw what befell the experimenter.

By the 13th of April he had so nearly given up voluntary efforts to solve the problem that it seemed worth while to test his ability to get the idea by watching the experimenter.