Huxley contributed his share to the great questions which agitated the public not only by service on Commissions, but by delivering a large number of public addresses and writing a large number of essays on topics of special interest. Much of his work on scientific, educational, and general subjects took its first shape in the form of addresses given to some public audience. University audiences in England, Scotland, and America were familiar to him, and from time to time he addressed large gatherings of a mixed character. But probably his favourite audience was composed of working men, and he had the greatest respect for the intelligence and sympathy of hearers who like himself passed the greater portion of their time in hard work. Professor Howes, his pupil, friend, and successor, writes of him: "He gave workmen of his best. The substance of _Man's Place in Nature_, one of the most successful and popular of his writings, and of his _Crayfish_, perhaps the most perfect zoölogical treatise ever published, was first communicated to them. In one of the last communications I had with him, I asked his views as to the desirability of discontinuing the workmen's lectures at Jermyn Street, since the development of workmen's colleges and institutes was regarded by some as rendering their continuance unnecessary. He replied, almost with indignation, 'With our central situation and resources we ought to be in a position to give the workmen that which they cannot get elsewhere,' adding that he would deeply deplore any such discontinuance."