He was next made chairman of the provincial committee of safety, a body which began its sittings at the comfortable, old-fashioned hour of six o'clock in the morning. Its duty was to call out and organize all the military resources of Pennsylvania, and generally to provide for the defenses of the province. It worked with much efficiency in its novel and difficult department. Among other things, Franklin devised and constructed some ingenious "marine _chevaux de frise_" for closing the river approaches to Philadelphia. In October, 1775, he was elected a member of the Assembly of the Province. But this did not add to his labors; for the oath of allegiance had not yet been dispensed with; he would not take it, and resigned his seat. In September, 1775, Franklin, Lynch of South Carolina, and Harrison of Virginia, as a committee of Congress, were dispatched to Cambridge, Massachusetts, to confer with Washington concerning military affairs. They rode from Philadelphia to the leaguer around Boston in thirteen days. Their business was achieved with no great difficulty; but they lingered a few days more in that interesting camp, and were absent six weeks. General Greene has recorded how he gazed upon Franklin, "that very great man, with silent admiration;" and Abigail Adams tells with what interest she met him whom "from infancy she had been taught to venerate," and how she read in his grave countenance "patriotism in its full lustre" and with it "blended every virtue of a Christian." The phrase was not well chosen to fall from the pen of Mrs. Adams, yet was literally true; Franklin had the virtues, though dissevered from the tenets which that worthy Puritan dame conceived essential to the make-up of a genuine Christian. The time came when her husband would not have let her speak thus in praise of Benjamin Franklin.