Often in his explorations he was told he could not travel in certain places, but he went on just the same to find out for himself.

He had a rare faculty of inducing enthusiasm in others, and by reposing complete confidence in the individual, impelled him to do his very best.

Thus he became the mainspring for much that was never credited to him, and which was really his in the germ or original idea.

Gilbert truly says, "it is not easy to separate the product of his personal work from that which he accomplished through the organisation of the work of others.

He was extremely fertile in ideas, so fertile that it was quite impossible that he should personally develop them all, and realising this, he gave freely to his collaborators.