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had passed beyond the northern liniit of the tree, perhaps a mile 

 or two from the line. No detailed maps of the neighborhood 

 were available then (or now), which made it difficult to get my 

 bearings. 



The imaginary line which forms the greater part of the bound- 

 ary between Georgia and Florida is supposed to take the most 

 direct course from the confluence of the Flint and Chattahoochee 

 Rivers to the head of the St. Mary's, bearing about S. 87° E.; 

 but surveying a straight line to connect two points over 1,50 

 miles apart involves serious engineering difficulties, and three 

 lines were run at difTerent times in the last century, varying a 

 mile or so near the middle. The northernmost was finally 

 selected as the boundary, but at the point under consideration, 

 about a mile from the western extremity of the line, the possible 

 error is only a few yards. 



While working in Florida between 1908 and 1915 I visited 

 River Junction a few times, and saw the Tumion near there, but 

 made no further effort to determine its northern limit. But 

 on August 16, 1918, while on business for the U. S. Bureau of 

 Plant Industry, I had a few hours between trains there, during 

 which I explored the neighborhood a little, not having been 

 there at that season since 1903. 



The northern boundary of the grounds of the Florida Insane 

 Hospital at Chattahoochee, about a mile and a half north of 

 River Junction, is marked by a stout wire fence which is said 

 to be exactly on the state line, and terminates on the west about a 

 mile from the river, at a road running approximately north and 

 south. Having followed the boundary fence until I came to 

 the road, I turned north into Georgia, and about a hundred 

 yards farther on, seeing some interesting- looking woods at the 

 left of the road, I entered them. A few steps down the slope, 

 a ravine appeared at my right {i.e., north), and in that I found 

 several trees of Tumion taxifolium, some about a foot in diameter 

 and forty feet tall, together with its common associates, Magnolia 

 grandiflora, Fagus, Liriodendron, Ilex opaca, Acer Floridanum, 

 Pinus glabra, Quercus alba, Pinus Taeda, Cercis, Ostrya and 

 Liquidambar (to mention trees only). 



