52 THE PLANT WOBLD 



braska, describecP^ specimens wliicli lie had obtained from the same 

 locality, under the name of Archihicoria siouxensis, thus creating a new 

 genus for them. They are undoubtedly " ancient hickories," but I 

 doubt if the differences are great enough to exclude them from Hicoria. 

 However, they may as well remain for the present under the name 

 given them by Professor Barbour. 



The probable manner in which these perfect replacements were 

 formed is of interest. When the nuts were dropped into the water of 

 the ancient lake, the kernel rotted away, but the shell being tough and 

 hard, would probably last for years under favorable circumstances. 

 "Throughout the clays and marls of the Bad Lands there is a large 

 amount of potash. This is dissolved b}^ water, and then acts upon 

 quartz, carrying it away in solution. This would find its way by infil- 

 tration into the interior of the nut. At the same time with this pro- 

 cess, carrying lime carbonate in solution, was going on, so that doubt- 

 less the stone kernels consisting of pretty nearly equal parts of lime 

 and silica, were deposited within the nuts. These kernels, of course, 

 become hard and flinty in time and capable of resisting almost any 

 amount of weathering. Not so the organic shell ; this eventually would 

 decay away, and so leave the filling or kernel of chalcedony and lime." 



The forestry exhibit at the Pan-American Exposition will be very 

 extensive and comprehensive. It will include a large display from 

 Louisiana. In that State there are fully fifty different varieties of hard 

 Avood, and each ^vdll be represented in the exhibit, besides specimens of 

 shrubbery, plants and mosses. Some of the specimens measure eiglit 

 feet in diameter, and others from six feet down. Some palmetto stalks 

 measure sixteen feet. There are several bundles of large reed cane 

 forty feet long and two inches around. The small cane is about ten 

 feet long. Tliere are also specimens of green Spanish moss and Span- 

 ish black moss. The unique feature of this exhibit are about 6,000 lit- 

 tle blocks of wood which mil be distributed at the Exposition as sou- 

 venirs. Bed cypress, white cypress, red oak, white oak, cow oak, water 

 oak, striped oak, live oak, red gum, black gum, white ash, blue ash, yel- 

 low ash, lynnewood, cottonwood, sycamore, elm, slippery elm, mul- 

 berry, locust, thorn locust, burdock, persimmon, ironwood, beech, mag- 

 nolia, long-leaved pine, red pine, red sassafras, water elm, walnut, bitter 

 pecan, pecan, cedar, prickly ash, wild haw, red haw, may haw, wild 

 plum, willow, maple, elder, white hickory, red hickory, wild hickory 

 and cherry represent the principal varieties that vdW be seen at the Ex- 

 position from Louisiana. 



* Nebraska Historical Society, II. 2; 272, />/. V. 1898. 



