[214] “Useful Trees for Roadside Planting,” a paper before the Michigan State Good Roads Association, 1921.
[215] “Forestry and Irrigation,” August, 1903.
[216] Snow: “The Principal Species of Wood.” 2d Ed., Wiley & Sons, N. Y.
[217] Op. cit.
[218] Congressional Record, Senate Doc. 156, Vol. V, 58th Cong.
[219] Op. cit.
[220] New Nature Library, Vol. III, p. 411, “The Tree Book,” by Julia E. Rogers. Doubleday, Page & Co., New York, 1914.
[221] This Indian word seems to have been applied to many plants the leaves or bark of which was used for smoking.
CHAPTER XIII
AIDS AND ATTRACTIONS TO TRAFFIC AND TRAVEL
It is a well-recognized fact that pleasure riding constitutes by far the greater part of automobile riding. With ten million pleasure cars and two million trucks that is obvious, notwithstanding every pleasure car is used more or less for business.