"They did a great many other things, though, besides fighting, and their life was spent so much out of doors that they studied the nature of every plant and living thing about them. The healing-properties of some of our most valuable herbs were first discovered by the Indians, and, as they never had any grocery-stores, the presence of trees that would supply them with sugar was a blessing not likely to be neglected. The devoted missionary John Brainerd first heard of this tree-sugar from them, and it is said that he used to preach to them when they were thus peacefully employed, and obtained a better hearing than at other times."