PLATE 17. -SWEET GUM, HACKBERRY, AND GINGKO. 



Sweet Guiii, leaves and fruit. 2. Hackherry in winter. 3. Gingko, winter 

 twifj. 4. Ginjjko, lea\es. 5. Street of Gingkos, leading- from grounds of tlie 

 United States Department of Agriculture, Wa.sliington, D. C. Thirty years old. 



