RELATION BETWEEN EVAPORATION AND PLANT SUCCESSION 1 63 
charum, Fagus grandifolia, Tilia americana, Pinus resinosa, and Pinus 
strobus. Among the herbaceous species are several grasses {Panicum 
xanthophysum, Danthonia spicata, Poa pratensis, Agrostis hiemalis, 
Np. Location. 
Hardwood Series. 
I. Cutover in 1914-15. 
Cc. in 
40- Day 
590 
2. 
Cutover in 1914-15. 
561 
Open place in old cut. 
453 
4- 
Cutover in 1913-14. 
425 
s- 
Cutover in 1913-14. 
416 
6. 
New margin of woods. 
378 
Within margin go meters. 
240 
8. 
Pine Point hardwoods. 
9- 
Opening in dense woods. 
187 
10. 
Within dense Aspen thicket. 
179 
II. 
Dense hardwoods. 
175 
12. 
Very dense hardwoods. 
^47 
13. 
Burntover hardwoods near Bryant 
s. 473 
14. 
Bare ground near laboratory. 
524 
15- 
Burntover pine land near Bryant's 
513 
16. 
Pine in Aspen Series. 
Exposed place in upper flat. 
347 
17. 
Exposed place on hill. 
321 
18. 
Exposed place in lower flat. 
315 
19. 
Exposed place on hill. 
310 
20. 
Aspens in lower flat. 
288 
21. 
Crest of slope in Aspens. 
238 
22. 
Aspens in upper flat. 
198 
2.3- 
Aspens in upper flat. 
197 
24. 
Aspens in middle flat. 
196 
25- 
Aspens in middle flat. 
187 
26. Foot of slope in Aspens. 
178 
Scc/daj 
-7t 
Fig. I. Diagram showing the total evaporation and the rate per day for 40 
days (July 10 to August 19, 1915) from different stations in hardwood and pine land 
in the vicinity of Douglas Lake, Michigan. 
Agrostis alba, and Oryzopsis asperifolia) , a very few sedges, and other 
plants, such as. Convolvulus spithamaeus, Aster laevis, Hieracium sca- 
brum, Hieracium venosum, Solidago canadensis, Melampyrum lineare, 
Fragaria virginiana, Smilacina stellata, besides such common weeds as, 
Erigeron canadensis, Rumex acetosella, Lepidium virginicum, Epilobium 
