3 2 6 
The Ohio Naturalist. 
[Vol. VIII, No. 6, 
gonifolia , and Oenothera oakesiana are here more important vege- 
tational elements than they are in the true Sand Plain. The 
successional stages following such a blowout formation are not 
clear; generally with the constant shifting of the sand the blowout 
is filled up with sand before a succeeding stage can become of 
importance. Perhaps, as in the case of the heath, the oak forest 
may be able to take possession without the intervention of a 
thicket stage. 
Fig. 14. Juniper-capped dunes north of the Lake Laboratory. The 
blowout has Panicum, Andropogon, Artemisia, Salix interior. At base of 
dune at extreme right is a small patch of Arctostaphylos uva-ursi' 
To the north of the Laboratory a short distance the dunes are 
mostly capped by good sized Junipers and it is plainly to be seen 
(Figs. 13 and 14) that with the death of these plants the dunes will 
be quickly destroyed. This locality must in the not distant 
past have been occupied by an Arctostaphylos-Juniperus Heath 
Formation, but with some sort of a change in the environment 
the conditions have become such that the deciduous dune and 
blowout formations have advanced towards the north, the 
Juniperus -capped dunes thus being remnants of a former 
heath. Possibly the reproduction of Junipers under the pro¬ 
tection of vegetation other than the heath, as in Fig. 12 under 
Quercus imbricaria, may be concerned prominently with such 
conditions. 
